Global Warming Crossword

Across 2. One of the main sources of carbon dioxide is _______. 4. One of the main sources of methane is ______. 5. The polar ice caps are ______ because of global warming. 6. Sunlight is _______ by pollution, like carbon dioxide, in the atmosphere. 7. Global warming means that the atmosphere gets ______ and heats the earth. Down 1. _______ instead of driving is one of the main ways we can stop global warming. 2. ______ enters and leaves the atmosphere.

Word Bank

melting cars walking hot sunlight trapped cows