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Across 1. 99% of countries use this to measure temperature 3. O2 5. CO2 7. fossil fuel that is used to make gasoline 9. raises on earth when heat is trapped by greenhouse effect 10. 21% of the air we breath, O2 11. green house gas that comes from rotting garbage 13. mass removal of trees 15. CH4 16. made up of nitrogen, oxygen and other gases 17. measured by celcious and fahrenheit 18. 3 R's Renew, Reduce and R

Down 2. green house gas that comes from burning fossil fuel, CO2 4. carbon dioxide and methane 5. a fossil fuel 6. US uses this to measure temperature 8. worldwide has increased over the past 200 years 12. is reduced when deforestation occurs, photosynthesis is reduced 14. 78% of the air we breath