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Across 2. Used on solar energized cars 4. Second greatest source of air pollution in U.S 5. Study of weather 8. Type of fuel made from plant or animal remains 10. A type of renewable energy 12. One of six greenhouse gases to be curbed under Kyoto protocol 16. Insects that thrive as the world warms, like hot weather 17. Large bodies of frozen water that melt as global warming increases

Down 1. A layer in earth's atmosphere 3. Solar is one type 4. Part of the climate system 6. A type of electric car battery 7. A type of renewable energy 9. A fossil fuel made 11. Average of weather 13. A name for an international environmental treaty 14. The name for a environmental-free car 15. Used for fuels, come from fossils