Dr. Allison Leidner, scientist, Earth Science Division, NASA Headquarters, speaks about Earth’s biodiversity at NASA's Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)
Dr. Allison Leidner, scientist, Earth Science Division, NASA Headquarters, speaks about Earth’s biodiversity at NASA's Earth Day event on Thursday, April 19, 2018 at Union Station in Washington, D.C. Photo Credit: (NASA/Aubrey Gemignani)