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  1. 3. The layer of gases that surround the earth.
  2. 6. dioxide CO2
  3. 7. spills pollute sea water and kill marine life
  4. 10. the process by which land changes into desert.
  5. 13. any naturally occurring, inexhaustible source of energy
  6. 16. the cutting down of trees in a large area
  7. 17. rain a form of precipitation that contains pollution
  8. 19. a biological community of interacting organisms and their physical environment.
  1. 1. the power from something which can do work, There are different types of it: solar, nuclear, hydroelectric...
  2. 2. warming a gradual increase in world temperatures caused by polluting gases
  3. 4. friendly with the environment
  4. 5. the process of making land, water, air, etc., dirty and not safe
  5. 6. non natural fertilizers given to plants with the intention of promoting growth.
  6. 8. the increasing population of the world
  7. 9. layer a layer in the earth's atmosphere that screens out the sun's harmful ultraviolet radiation.
  8. 11. the place where we live the water we drink, the air that we breath
  9. 12. effect an increase in the amount of carbon dioxide and other gases in the atmosphere
  10. 14. species birds/plants/species animals or plants which may soon not exist
  11. 15. the variety of plant and animal life in the world.
  12. 18. word that comes from smoke and fog