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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.