42. ORBITING CARBON OBSERVATORY 2

♤ It is a satellite launched by NASA to track carbon dioxide, a leading greenhouse gas that is responsible for global warming.

♤ The satellite is now on its way to join theA-Train, a constellation of five other international Earth- observing satellites.

♤ The OCO-2 mission is to analyse the sources and sinks of this carbon dioxide and to find better ways to manage it.

♤ The observatory with field of view about one square mile (three square kilometres) will take 24 measurements of carbon in the atmosphere every second but clouds are a major obstacle.