填空题
| Information about bow NASA studies earth’s climate. | ||
| Earth Day began in the year of ______. | 1 | |
| The main aim of Orbiting Carbon Observatory is to measure
carbon dioxide ______. |
2 | |
| Over the past decade, global temperatures have always been on the ______. | 3 | |
| In the long run, carbon dioxide is absorbed only by the ______. | 4 | |
| A large eruption of volcano may lead to ______. | 5 | |