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)

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)

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)

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)