VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers in the bucket trucks are securing the fairing ducting, GN2 purge line, and cable harnesses to the umbilical mast attached to Orbital Sciences' Taurus XL rocket. Atop the rocket is NASA's Orbiting Carbon Observatory, or OCO, which is scheduled to launch Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers remove the scaffolding surrounding Orbital Sciences' Taurus XL rocket. Atop the rocket is NASA's Orbiting Carbon Observatory, or OCO, which is scheduled to launch Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers remove the umbilical tower attached to Orbital Sciences' Taurus XL rocket. Atop the rocket is NASA's Orbiting Carbon Observatory, or OCO, which is scheduled to launch Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers remove the umbilical tower attached to Orbital Sciences' Taurus XL rocket. Atop the rocket is NASA's Orbiting Carbon Observatory, or OCO, which is scheduled to launch Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

VANDENBERG AIR FORCE BASE, Calif. -- On Launch Complex 576-E at Vandenberg Air Force Base in California, workers remove the umbilical tower attached to Orbital Sciences' Taurus XL rocket. Atop the rocket is NASA's Orbiting Carbon Observatory, or OCO, which is scheduled to launch Feb. 24 from Vandenberg. The spacecraft will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. Photo credit: NASA/Richard Nielsen, VAFB

A spatial map of the amount of carbon dioxide (CO2) present in columns of the atmosphere below NASA's Orbiting Carbon Observatory-2 (OCO-2) satellite as it flew over Las Vegas on Feb. 8, 2018. Warmer colors over the city center indicate higher amounts of carbon dioxide. https://photojournal.jpl.nasa.gov/catalog/PIA23781

This image shows NASA OCO-2 measurements of carbon dioxide levels over Pasadena and the northern Los Angeles basin on Sept. 5, 2014. Each colored dot represents a single measurement of the greenhouse gas made during an overflight of the area.

Kevin Mark, Orbiting Carbon Observatory 3 (OCO-3) purge engineer with NASA’s Jet Propulsion Laboratory, secures a separate fixture of OCO-3, stored apart from its payload container, on the truck transporting it from the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, where it will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

Kevin Mark, Orbiting Carbon Observatory 3 (OCO-3) purge engineer with NASA’s Jet Propulsion Laboratory, fastens a separate fixture of OCO-3, stored apart from its payload container, to a truck for transport from the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, where it will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

NASA’s Orbiting Carbon Observatory 3, or OCO-3, payload container is moved from the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida to a truck that will transport it to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, where it will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

A transportation container carrying NASA’s Orbiting Carbon Observatory 3, or OCO-3, payload is moved to a truck for its transport from the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, where it will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

A forklift moves the transportation container carrying NASA’s Orbiting Carbon Observatory 3, or OCO-3, payload to a truck for its move from the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, where it will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

A forklift moves the transportation container carrying NASA’s Orbiting Carbon Observatory 3, or OCO-3, payload to a truck for its move from the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, where it will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

A transportation container carrying NASA’s Orbiting Carbon Observatory 3, or OCO-3, payload is moved to a truck for transport from the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, where it will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

Workers move NASA’s Orbiting Carbon Observatory 3, or OCO-3, payload container out of the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida to board a truck that will transport it to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, where it will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

Workers prepare to move NASA’s Orbiting Carbon Observatory 3, or OCO-3, payload container out of the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida onto a truck that will transport it to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, which will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

Workers prepare to move NASA’s Orbiting Carbon Observatory 3, or OCO-3, payload container out of the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida onto a truck that will transport it to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, where it will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

NASA’s Orbiting Carbon Observatory 3, or OCO-3, sits in a transportation container at the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida prior to its move to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, which will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

NASA’s Orbiting Carbon Observatory 3, or OCO-3, payload sits in a transportation container at the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida in preparation for its move to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, where it will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

NASA’s Orbiting Carbon Observatory 3, or OCO-3, sits in a transportation container at the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida prior to its move to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft, where it will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

A transportation container carrying NASA’s Orbiting Carbon Observatory 3, or OCO-3, payload sits at the Space Station Processing Facility high bay at the agency’s Kennedy Space Center in Florida bearing a warning sign of low oxygen levels from an active GN2 (gaseous nitrogen that creates a dry atmosphere) purge prior to its move to the SpaceX facility on March 18, 2019. The OCO-3 payload will be stowed in the trunk of SpaceX’s Dragon spacecraft and will launch aboard a Falcon 9 rocket on the company’s 17th Commercial Resupply Services mission to the International Space Station. Launch is scheduled for April 25, 2019, from Launch Complex 40 at Cape Canaveral Air Force Station. Once the payload reaches the station, it will be removed from Dragon and robotically installed on the exterior of the orbiting laboratory’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate.

Global average carbon dioxide concentrations as seen by NASA’s Orbiting Carbon Observatory-2 mission, June 1-15, 2015. OCO-2 measures carbon dioxide from the top of Earth's atmosphere to its surface. Higher carbon dioxide concentrations are in red, with lower concentrations in yellows and greens. Scientists poring over data from OCO-2 mission are seeing patterns emerge as they seek answers to questions about atmospheric carbon dioxide. Among the most striking features visible in the first year of OCO-2 data is the increase in carbon dioxide in the northern hemisphere during winter, when trees are not removing carbon dioxide, followed by its decrease in spring, as trees start to grow and remove carbon dioxide from the atmosphere. http://photojournal.jpl.nasa.gov/catalog/PIA20039

Ralph Basilio, OCO-2 project manager, Jet Propulsion Laboratory, discusses the successful launch of the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Wednesday, July 2, 2014, at the Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

VANDENBERG AIR FORCE BASE, Calif. – News media representatives converge on Space Launch Complex 2 at Vandenberg Air Force Base in California to cover the launch of NASA's Orbiting Carbon Observatory-2, or OCO-2. Final preparations for launch of OCO-2 at 5:56 a.m. EDT on July 1 aboard a United Launch Alliance Delta II rocket are underway on the pad. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Ben Smegelsky

Ralph Basilio, OCO-2 project manager, JPL, discusses the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Sunday, June 29, 2014, at the Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

Ralph Basilio, OCO-2 project manager, JPL, discusses the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Sunday, June 29, 2014, at the Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

Ralph Basilio, OCO-2 project manager with NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California, left, and Mike Gunson, OCO-2 project scientist at JPL, discuss the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Thursday, June 12, 2014, at NASA Headquarters in Washington. OCO-2 is set for a July 1, 2014 launch from Vandenberg Air Force Base in California. Its mission is to measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

Betsy Edwards, OCO-2 program executive, NASA Headquarters, discusses the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Sunday, June 29, 2014, at the Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

VANDENBERG AIR FORCE BASE, Calif. – The mobile service tower on Space Launch Complex 2 at Vandenberg Air Force Base in California rolls away from the United Launch Alliance Delta II rocket carrying NASA's Orbiting Carbon Observatory-2, or OCO-2. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – Final preparations are underway for the launch of NASA's Orbiting Carbon Observatory-2, or OCO-2, aboard a United Launch Alliance Delta II rocket, following rollback of the mobile service tower on Space Launch Complex 2 on Vandenberg Air Force Base in California. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – The United Launch Alliance Delta II rocket carrying NASA's Orbiting Carbon Observatory-2, or OCO-2, is illuminated on Space Launch Complex 2 on Vandenberg Air Force Base in California following rollback of the mobile service tower. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – NASA's Orbiting Carbon Observatory-2, or OCO-2, satellite sits atop a United Launch Alliance Delta II rocket prior to encapsulation in its payload fairing at Space Launch Complex 2 at Vandenberg Air Force Base in California. Launch is scheduled for 2:56 a.m. PDT 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://oco.jpl.nasa.gov Photo credit: NASA/Mark Mackley

VANDENBERG AIR FORCE BASE, Calif. – The United Launch Alliance Delta II rocket carrying NASA's Orbiting Carbon Observatory-2, or OCO-2, is illuminated on Space Launch Complex 2 on Vandenberg Air Force Base in California following rollback of the mobile service tower. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – Preparations are underway on Vandenberg Air Force Base in California to launch NASA's Orbiting Carbon Observatory-2, or OCO-2. Launch aboard a United Launch Alliance Delta II rocket from Space Launch Complex 2 is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – At Vandenberg Air Force Base in California, the United Launch Alliance Delta II rocket carrying NASA's Orbiting Carbon Observatory-2, or OCO-2, awaits loading of its cryogenic propellants following rollback of the mobile service tower on Space Launch Complex 2. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – NASA's Orbiting Carbon Observatory-2, or OCO-2, stands ready for launch aboard a United Launch Alliance Delta II rocket following rollback of the mobile service tower on Space Launch Complex 2 on Vandenberg Air Force Base in California. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – NASA's Orbiting Carbon Observatory-2, or OCO-2, satellite sits atop a United Launch Alliance Delta II rocket prior to encapsulation in its payload fairing at Space Launch Complex 2 at Vandenberg Air Force Base in California. Launch is scheduled for 2:56 a.m. PDT 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://oco.jpl.nasa.gov Photo credit: NASA/Mark Mackley

VANDENBERG AIR FORCE BASE, Calif. – The mobile service tower on Space Launch Complex 2 at Vandenberg Air Force Base in California begins to roll back from the United Launch Alliance Delta II rocket with NASA's Orbiting Carbon Observatory-2, or OCO-2, aboard. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – NASA's Orbiting Carbon Observatory-2, or OCO-2, satellite sits atop a United Launch Alliance Delta II rocket prior to encapsulation in its payload fairing at Space Launch Complex 2 at Vandenberg Air Force Base in California. Launch is scheduled for 2:56 a.m. PDT 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://oco.jpl.nasa.gov Photo credit: NASA/Mark Mackley

VANDENBERG AIR FORCE BASE, Calif. – Final preparations are underway for the launch of NASA's Orbiting Carbon Observatory-2, or OCO-2, aboard a United Launch Alliance Delta II rocket, following rollback of the mobile service tower on Space Launch Complex 2 on Vandenberg Air Force Base in California. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – NASA's Orbiting Carbon Observatory-2, or OCO-2, satellite sits atop a United Launch Alliance Delta II rocket prior to encapsulation in its payload fairing at Space Launch Complex 2 at Vandenberg Air Force Base in California. Launch is scheduled for 2:56 a.m. PDT 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://oco.jpl.nasa.gov Photo credit: NASA/Mark Mackley

VANDENBERG AIR FORCE BASE, Calif. – Space Launch Complex 2 on Vandenberg Air Force Base in California is illuminated following the rollback of the mobile service tower, preparing the way for launch of NASA's Orbiting Carbon Observatory-2, or OCO-2, aboard a United Launch Alliance Delta II rocket. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – At Vandenberg Air Force Base in California, the United Launch Alliance Delta II rocket carrying NASA's Orbiting Carbon Observatory-2, or OCO-2, awaits loading of its cryogenic propellants following rollback of the mobile service tower on Space Launch Complex 2. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – Logos affixed to the United Launch Alliance Delta II rocket in the mobile service tower on Space Launch Complex 2 at Vandenberg Air Force Base in California identify the major participants in the upcoming launch. The rocket will be carrying NASA's Orbiting Carbon Observatory-2, or OCO-2, to orbit. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – The United Launch Alliance Delta II rocket carrying NASA's Orbiting Carbon Observatory-2, or OCO-2, is ready for launch over the flame trench on Space Launch Complex 2 at Vandenberg Air Force Base in California following rollback of the mobile service tower. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – The mobile service tower on Space Launch Complex 2 at Vandenberg Air Force Base in California rolls away from the United Launch Alliance Delta II rocket carrying NASA's Orbiting Carbon Observatory-2, or OCO-2. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – The mobile service tower on Space Launch Complex 2 at Vandenberg Air Force Base in California begins to roll back from the United Launch Alliance Delta II rocket with NASA's Orbiting Carbon Observatory-2, or OCO-2, aboard. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – NASA's Orbiting Carbon Observatory-2, or OCO-2, is ready for launch aboard a United Launch Alliance Delta II rocket following rollback of the mobile service tower on Space Launch Complex 2 on Vandenberg Air Force Base in California. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – Nightfall on Space Launch Complex 2 at Vandenberg Air Force Base in California follows the rollback of the mobile service tower for launch of NASA's Orbiting Carbon Observatory-2, or OCO-2, aboard a United Launch Alliance Delta II rocket. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – Space Launch Complex 2 at Vandenberg Air Force Base in California is illuminated following the rollback of the mobile service tower, preparing the way for launch of NASA's Orbiting Carbon Observatory-2, or OCO-2, aboard a United Launch Alliance Delta II rocket. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – Preparations are underway to roll the mobile service tower away from the United Launch Alliance Delta II rocket carrying NASA's Orbiting Carbon Observatory-2, or OCO-2, at Space Launch Complex 2 on Vandenberg Air Force Base in California. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – Nightfall on Space Launch Complex 2 at Vandenberg Air Force Base in California follows the rollback of the mobile service tower for launch of NASA's Orbiting Carbon Observatory-2, or OCO-2, aboard a United Launch Alliance Delta II rocket. Launch is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – In the mobile service tower at Space Launch Complex 2 at Vandenberg Air Force Base in California, the payload fairing for NASA's Orbiting Carbon Observatory-2, or OCO-2, satellite is being prepared for encapsulation atop a United Launch Alliance Delta II rocket. Launch is scheduled for 2:56 a.m. PDT 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://oco.jpl.nasa.gov Photo credit: NASA/Mark Mackley

VANDENBERG AIR FORCE BASE, Calif. – Preparations are underway to launch NASA's Orbiting Carbon Observatory-2, or OCO-2, at Space Launch Complex 2 on Vandenberg Air Force Base in California. Launch aboard a United Launch Alliance Delta II rocket is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

Geoff Yoder, deputy associate administrator for programs, Science Mission Directorate, NASA Headquarters, discusses the successful launch of the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Wednesday, July 2, 2014, at the Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

Mike Miller, senior vice president, Science and Environmental Satellite Programs, Orbital Sciences Space Systems Group, discusses the successful launch of the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Wednesday, July 2, 2014, at the Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

Mike Miller, senior vice president, Science and Environmental Satellite Programs, Orbital Sciences Space Systems Group, discusses the successful launch of the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Wednesday, July 2, 2014, at the Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

NASA Kennedy Space Center Public Affairs Officer George Diller, moderates a post-launch press briefing, following the successful launch of the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, Wednesday, July 2, 2014, at the Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

Mike Gunson, OCO-2 project scientist with NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California, discusses the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Thursday, June 12, 2014, at NASA Headquarters in Washington. OCO-2 is set for a July 1, 2014 launch from Vandenberg Air Force Base in California. Its mission is to measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

Mike Gunson, OCO-2 project scientist with NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California, listens to a question during a press briefing for the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, Thursday, June 12, 2014, at NASA Headquarters in Washington. OCO-2 is set for a July 1, 2014 launch from Vandenberg Air Force Base in California. Its mission is to measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

Mike Gunson, OCO-2 project scientist with NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California, discusses the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Thursday, June 12, 2014, at NASA Headquarters in Washington. OCO-2 is set for a July 1, 2014 launch from Vandenberg Air Force Base in California. Its mission is to measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

Ralph Basilio, OCO-2 project manager with NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California discusses the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Thursday, June 12, 2014, at NASA Headquarters in Washington. OCO-2 is set for a July 1, 2014 launch from Vandenberg Air Force Base in California. Its mission is to measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

Betsy Edwards, OCO-2 program executive with the Science Mission Directorate at NASA Headquarters in Washington discusses the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Thursday, June 12, 2014, at NASA Headquarters in Washington. OCO-2 is set for a July 1, 2014 launch from Vandenberg Air Force Base in California. Its mission is to measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

Tim Dunn, NASA launch director, Kennedy Space Center, discusses the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Sunday, June 29, 2014, at the Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

Ralph Basilio, OCO-2 project manager with NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California discusses the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Thursday, June 12, 2014, at NASA Headquarters in Washington. OCO-2 is set for a July 1, 2014 launch from Vandenberg Air Force Base in California. Its mission is to measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

NASA Headquarters Public Affairs Officer Steve Cole, standing, moderates a Orbiting Carbon Observatory-2 (OCO-2) briefing with (from left), Betsy Edwards, OCO-2 program executive with the Science Mission Directorate at NASA Headquarters, Ralph Basilio, OCO-2 project manager with NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California, Mike Gunson, OCO-2 project scientist with JPL, and Annmarie Eldering, OCO-2 deputy project scientist JPL, , Thursday, June 12, 2014, at NASA Headquarters in Washington. OCO-2, NASA’s first spacecraft dedicated to studying carbon dioxide, is set for a July 1, 2014 launch from Vandenberg Air Force Base in California. Its mission is to measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

Annmarie Eldering, OCO-2 deputy project scientist with NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California, demonstrates with a few white beans in a container of black beans the small differences in carbon dioxide in the atmosphere that the Orbiting Carbon Observatory-2 (OCO-2) will be able to measure, during a press briefing, Thursday, June 12, 2014, at NASA Headquarters in Washington. OCO-2, NASA’s first spacecraft dedicated to studying carbon dioxide, is set for a July 1, 2014, launch from Vandenberg Air Force Base in California. Its mission is to measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. Photo Credit: (NASA/Bill Ingalls)

Ken Jucks, OCO-2 program scientist, NASA Headquarters talks during an Orbiting Carbon Observatory-2 (OCO-2) science briefing, Sunday, June 29, 2014, Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

Dave Crisp, OCO-2 science team leader, JPL talks during an Orbiting Carbon Observatory-2 (OCO-2) science briefing, Sunday, June 29, 2014, Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

VANDENBERG AIR FORCE BASE, Calif. -- At Vandenberg Air Force Base in California, the transporter holding NASA's Orbiting Carbon Observatory, or OCO, heads for Launch Complex 576-E. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. OCO is scheduled to launch Feb. 24 aboard an Orbital Sciences' Taurus XL rocket. Photo credit: NASA/VAFB

Dave Crisp, OCO-2 science team leader, JPL talks during an Orbiting Carbon Observatory-2 (OCO-2) science briefing, Sunday, June 29, 2014, Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

VANDENBERG AIR FORCE BASE, Calif. -- At Vandenberg Air Force Base in California, the transporter holding NASA's Orbiting Carbon Observatory, or OCO, heads for Launch Complex 576-E. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. OCO is scheduled to launch Feb. 24 aboard an Orbital Sciences' Taurus XL rocket. Photo credit: NASA/VAFB

Annmarie Eldering, OCO-2 deputy project scientist, JPL is seen talking on the monitors during an Orbiting Carbon Observatory-2 (OCO-2) science briefing, Sunday, June 29, 2014, Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

VANDENBERG AIR FORCE BASE, Calif. -- At Vandenberg Air Force Base in California, the transporter holding NASA's Orbiting Carbon Observatory, or OCO, arrives on Launch Complex 576-E. OCO will collect precise global measurements of carbon dioxide (CO2) in the Earth's atmosphere. Scientists will analyze OCO data to improve our understanding of the natural processes and human activities that regulate the abundance and distribution of this important greenhouse gas. OCO is scheduled to launch Feb. 24 aboard an Orbital Sciences' Taurus XL rocket. Photo credit: NASA/VAFB

Ken Jucks, OCO-2 program scientist, NASA Headquarters talks during an Orbiting Carbon Observatory-2 (OCO-2) science briefing, Sunday, June 29, 2014, Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

Annmarie Eldering, OCO-2 deputy project scientist, JPL talks during an Orbiting Carbon Observatory-2 (OCO-2) science briefing, Sunday, June 29, 2014, Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

VANDENBERG AIR FORCE BASE, Calif. – A post-launch news conference is held at Vandenberg Air Force Base in California following the successful launch of NASA's Orbiting Carbon Observatory-2, or OCO-2. From left are Ralph Basilio, OCO-2 project manager at NASA's Jet Propulsion Laboratory Mike Miller, senior vice president, Science and Environmental Satellite Programs, Orbital Sciences Space Systems Group and Geoff Yoder, deputy associate administrator for Programs, Science Mission Directorate, NASA Headquarters. Liftoff of OCO-2 from Space Launch Complex 2 aboard a United Launch Alliance Delta II rocket was on schedule at 5:56 a.m. EDT on July 2 following the repair of the pad's water suppression system, which failed on the first launch attempt July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – From left, Ken Jucks, Orbiting Carbon Observatory-2, or OCO-2, project executive at NASA Headquarters David Crisp, OCO-2 science team leader at NASA's Jet Propulsion Laboratory, or JPL and Annmarie Eldering, OCO-2 deputy project scientist at JPL, participate in a mission science briefing at Vandenberg Air Force Base in California prior to the launch of the observatory. Launch aboard a United Launch Alliance Delta II rocket from Space Launch Complex 2 is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – A post-launch news conference is held at Vandenberg Air Force Base in California following the successful launch of NASA's Orbiting Carbon Observatory-2, or OCO-2. From left are Ralph Basilio, OCO-2 project manager at NASA's Jet Propulsion Laboratory Mike Miller, senior vice president, Science and Environmental Satellite Programs, Orbital Sciences Space Systems Group and Geoff Yoder, deputy associate administrator for Programs, Science Mission Directorate, NASA Headquarters. Liftoff of OCO-2 from Space Launch Complex 2 aboard a United Launch Alliance Delta II rocket was on schedule at 5:56 a.m. EDT on July 2 following the repair of the pad's water suppression system, which failed on the first launch attempt July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – Randy Pollock, project architect for NASA's Orbiting Carbon Observatory-2, or OCO-2, from NASA's Jet Propulsion Laboratory, or JPL, and Pavani Peddada, OCO-2 engineer from JPL, discuss the observatory with representatives of social media outlets attending a NASA Social at Vandenberg Air Force Base in California. Launch of OCO-2 aboard a United Launch Alliance Delta II rocket from Space Launch Complex 2 is scheduled for 5:56 a.m. EDT on July 1. The social media users selected to attend the two-day event on June 30 and July 1 are given the same access as news media in an effort to align their experience with those of traditional media. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Ben Smegelsky

VANDENBERG AIR FORCE BASE, Calif. – From left, George Diller, NASA Public Affairs Ken Jucks, Orbiting Carbon Observatory-2, or OCO-2, project executive at NASA Headquarters David Crisp, OCO-2 science team leader at NASA's Jet Propulsion Laboratory, or JPL and Annmarie Eldering, OCO-2 deputy project scientist at JPL, participate in a mission science briefing at Vandenberg Air Force Base in California prior to the launch of the observatory. Launch aboard a United Launch Alliance Delta II rocket from Space Launch Complex 2 is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – A representative of the news media asks a question at a prelaunch news conference at Vandenberg Air Force Base in California prior to the launch of NASA's Orbiting Carbon Observatory-2, or OCO-2. Participating in the news conference are Betsy Edwards, OCO-2 project executive at NASA Headquarters Tim Dunn, launch manager for NASA's Launch Services Program Vernon Thorp, United Launch Alliance program manager for NASA Missions and Ralph Basilio, OCO-2 project manager at NASA's Jet Propulsion Laboratory. Launch aboard a United Launch Alliance Delta II rocket from Space Launch Complex 2 is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

Vern Thorp, United Launch Alliance program manager, NASA missions,, left, Ralph Basilio, OCO-2 project manager, JPL, and Lt. Joseph Round, launch weather officer, USAF 30th Space Wing Weather Squadron, right, discuss the planned launch of the Orbiting Carbon Observatory-2 (OCO-2), NASA’s first spacecraft dedicated to studying carbon dioxide, during a press briefing, Sunday, June 29, 2014, at the Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

Ken Jucks, OCO-2 program scientist, NASA Headquarters, left, Dave Crisp, OCO-2 science team leader, JPL, and Annmarie Eldering, OCO-2 deputy project scientist, JPL, right, give a science briefing ahead of the planned launch of the Orbiting Carbon Observatory-2 (OCO-2), Sunday, June 29, 2014, Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

Ken Jucks, OCO-2 program scientist, NASA Headquarters, left, Dave Crisp, OCO-2 science team leader, JPL, and Annmarie Eldering, OCO-2 deputy project scientist, JPL, right, give a science briefing ahead of the planned launch of the Orbiting Carbon Observatory-2 (OCO-2), Sunday, June 29, 2014, Vandenberg Air Force Base, Calif. OCO-2 will measure the global distribution of carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 is set to launch on July 1, 2014 at 2:59 a.m. PDT. Photo Credit: (NASA/Bill Ingalls)

VANDENBERG AIR FORCE BASE, Calif. – Technicians monitor a half-section of the Delta II payload fairing as it is moved toward NASA's Orbiting Carbon Observatory-2, or OCO-2, in the mobile service tower at Space Launch Complex 2 on Vandenberg Air Force Base in California. The fairing will protect OCO-2 during launch aboard a United Launch Alliance Delta II rocket, scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://oco.jpl.nasa.gov. Photo credit: NASA/30th Space Wing, U.S. Air Force

VANDENBERG AIR FORCE BASE, Calif. – Col. Keith Balts, 30th Space Wing commander at Vandenberg Air Force Base in California, and Michael "Mic" Woltman, senior vehicle systems engineer for the Launch Services Program at NASA's Kennedy Space Center in Florida, discuss the upcoming launch of NASA's Orbiting Carbon Observatory-2, or OCO-2, with representatives of social media outlets attending a NASA Social at Vandenberg. Launch of OCO-2 aboard a United Launch Alliance Delta II rocket from Space Launch Complex 2 is scheduled for 5:56 a.m. EDT on July 1. The social media users selected to attend the two-day event on June 30 and July 1 are given the same access as news media in an effort to align their experience with those of traditional media. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Ben Smegelsky

VANDENBERG AIR FORCE BASE, Calif. – Preparations are underway to encapsulate NASA's Orbiting Carbon Observatory-2, or OCO-2, into the Delta II payload fairing in the mobile service tower at Space Launch Complex 2 on Vandenberg Air Force Base in California. The fairing will protect OCO-2 during launch aboard a United Launch Alliance Delta II rocket, scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://oco.jpl.nasa.gov. Photo credit: NASA/30th Space Wing, U.S. Air Force

VANDENBERG AIR FORCE BASE, Calif. – At Vandenberg Air Force Base in California, the United Launch Alliance Delta II rocket carrying NASA's Orbiting Carbon Observatory-2, or OCO-2, awaits loading of its cryogenic propellants following rollback of the mobile service tower on Space Launch Complex 2. Launch of OCO-2 is scheduled for 5:56 a.m. EDT on July 2 following the repair of the pad's water suppression system, which failed on the first launch attempt July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – Final preparations are underway at Space Launch Complex 2 on Vandenberg Air Force Base in California for liftoff of NASA's Orbiting Carbon Observatory-2, or OCO-2, aboard a United Launch Alliance Delta II rocket. Launch of OCO-2 is scheduled for 5:56 a.m. EDT on July 2 following the repair of the pad's water suppression system, which failed on the first launch attempt July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – The remaining half-section of the Delta II payload fairing moves into place around NASA's Orbiting Carbon Observatory-2, or OCO-2, in the mobile service tower at Space Launch Complex 2 on Vandenberg Air Force Base in California. The fairing will protect OCO-2 during launch aboard a United Launch Alliance Delta II rocket, scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://oco.jpl.nasa.gov. Photo credit: NASA/30th Space Wing, U.S. Air Force

VANDENBERG AIR FORCE BASE, Calif. – NASA's Orbiting Carbon Observatory-2, or OCO-2, is in position in the mobile service tower at Space Launch Complex 2 on Vandenberg Air Force Base in California, ready for encapsulation into the Delta II payload fairing. The fairing will protect OCO-2 during launch aboard a United Launch Alliance Delta II rocket, scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://oco.jpl.nasa.gov. Photo credit: NASA/30th Space Wing, U.S. Air Force

VANDENBERG AIR FORCE BASE, Calif. – Logos affixed to the mobile service tower at Space Launch Complex 2 on Vandenberg Air Force Base in California represent the principal players in the launch campaign underway at the pad. From the top are the logos for the National Aeronautics and Space Administration, or NASA the Orbiting Carbon Observatory-2, or OCO-2 and the United Launch Alliance, or ULA. Launch of NASA's OCO-2 satellite aboard a United Launch Alliance Delta II rocket is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Randy Beaudoin

VANDENBERG AIR FORCE BASE, Calif. – Preparations are underway to roll the mobile service tower away from the United Launch Alliance Delta II rocket carrying NASA's Orbiting Carbon Observatory-2, or OCO-2, at Space Launch Complex 2 on Vandenberg Air Force Base in California. Launch of OCO-2 is scheduled for 5:56 a.m. EDT on July 2 following the repair of the pad's water suppression system, which failed on the first launch attempt July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – Technicians prepare to roll the mobile service tower away from the United Launch Alliance Delta II rocket carrying NASA's Orbiting Carbon Observatory-2, or OCO-2, at Space Launch Complex 2 on Vandenberg Air Force Base in California. Launch of OCO-2 is scheduled for 5:56 a.m. EDT on July 2 following the repair of the pad's water suppression system, which failed on the first launch attempt July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – Representatives from social media outlets participate in a NASA Social at Vandenberg Air Force Base in California for the launch of NASA's Orbiting Carbon Observatory-2, or OCO-2. Launch of OCO-2 aboard a United Launch Alliance Delta II rocket from Space Launch Complex 2 is scheduled for 5:56 a.m. EDT on July 1. The social media users selected to attend the two-day event on June 30 and July 1 are given the same access as news media in an effort to align their experience with those of traditional media. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Ben Smegelsky

VANDENBERG AIR FORCE BASE, Calif. – From left, Betsy Edwards, Orbiting Carbon Observatory-2, or OCO-2, project executive at NASA Headquarters Tim Dunn, launch manager for NASA's Launch Services Program Vernon Thorp, United Launch Alliance program manager for NASA Missions and Ralph Basilio, OCO-2 project manager at NASA's Jet Propulsion Laboratory, participate in a prelaunch news conference at Vandenberg Air Force Base in California prior to the launch of the observatory. Launch aboard a United Launch Alliance Delta II rocket from Space Launch Complex 2 is scheduled for 5:56 a.m. EDT on July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – Final preparations are underway for the launch of NASA's Orbiting Carbon Observatory-2, or OCO-2, aboard a United Launch Alliance Delta II rocket, following rollback of the mobile service tower on Space Launch Complex 2 on Vandenberg Air Force Base in California. Launch of OCO-2 is scheduled for 5:56 a.m. EDT on July 2 following the repair of the pad's water suppression system, which failed on the first launch attempt July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett

VANDENBERG AIR FORCE BASE, Calif. – NASA Administrator Charles Bolden talks with representatives of the news media at Space Launch Complex 2 on Vandenberg Air Force Base in California during activities leading up to the launch of NASA's Orbiting Carbon Observatory-2, or OCO-2. Final preparations for launch of OCO-2 at 5:56 a.m. EDT on July 1 aboard a United Launch Alliance Delta II rocket are underway on the pad. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Ben Smegelsky

VANDENBERG AIR FORCE BASE, Calif. – NASA's Orbiting Carbon Observatory-2, or OCO-2, stands ready for launch aboard a United Launch Alliance Delta II rocket following rollback of the mobile service tower on Space Launch Complex 2 on Vandenberg Air Force Base in California. Launch of OCO-2 is scheduled for 5:56 a.m. EDT on July 2 following the repair of the pad's water suppression system, which failed on the first launch attempt July 1. OCO-2 is NASA’s first mission dedicated to studying atmospheric carbon dioxide, the leading human-produced greenhouse gas driving changes in Earth’s climate. OCO-2 will provide a new tool for understanding the human and natural sources of carbon dioxide emissions and the natural "sinks" that absorb carbon dioxide and help control its buildup. The observatory will measure the global geographic distribution of these sources and sinks and study their changes over time. To learn more about OCO-2, visit http://www.nasa.gov/oco2. Photo credit: NASA/Kim Shiflett