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Across
  1. 5. caused by the greenhouse effect
  2. 7. synonym: vast enhancements
  3. 11. a layer in the atmosphere
  4. 12. the heating of the earth
  5. 13. temperature rise
  6. 14. synonym: significantly decreased
  7. 17. waste gases
Down
  1. 1. something that you can use many times
  2. 2. a big forest near the equator
  3. 3. to cut down trees
  4. 4. surroundings
  5. 6. noun: pay attention to the nature
  6. 8. synonym: waste sorting
  7. 9. accelerates global warming
  8. 10. synonym: save natural materials
  9. 15. people who are organized in a environmental organization
  10. 16. very warm climate