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NASA's Orbiting Carbon Observatory-2 mission (OCO-2) launches from Vandenberg Air Force Base, in California July 2, 2014. The unmanned Delta 2 rocket blasted off from California on Wednesday, carrying a NASA science satellite to survey where carbon dioxide, a greenhouse gas tied to climate change, is moving into and out of Earth's atmosphere, a NASA Television broadcast showed. The 127-foot (39-meter) tall rocket lifted off at 2:56 a.m. PDT (5:56 a.m. EDT/0956 GMT) from Vandenberg Air Force Base, located about 150 miles (240 km) northwest of Los Angeles, and headed south over the Pacific Ocean. REUTERS/Gene Blevins (UNITED STATES - Tags: ENVIRONMENT SCIENCE TECHNOLOGY)