GO GREEN

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Across
  1. 3. Fuel obtained from dead and decaying remains
  2. 9. rain containing excessive acids
  3. 10. naturally decomposable substances
  4. 12. prevention of wasting a useful resource
  5. 13. A place with a high density of trees
  6. 14. conservation of waste to usable items
  7. 15. artificial surroundings created for the growing of plants
  8. 18. a place where garbage is disposed
Down
  1. 1. Planting of trees
  2. 2. Dangerous biological substances
  3. 4. A person who studies about environment
  4. 5. The variety of life found on Earth
  5. 6. Introduction of contaminants into the environment
  6. 7. Energy generated from the heat of the sun
  7. 8. gradual warming of earth dues to activities of man
  8. 10. The natural gas formed by manure
  9. 11. Gas which protects us from ultraviolet rays
  10. 16. The physical Earth and the things in it
  11. 17. the branch of biology that deals with the relation of organisms