Earth week puzzle

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Across
  1. 4. the earth warming up due to greenhouse gasses
  2. 5. these are oils such as crude oil
  3. 6. to make something very dirty
  4. 7. the only habitable planet
  5. 10. first people
  6. 12. to make less of something ex. William reduced the amount of clothing on his bed
  7. 13. the weather and temperature in an area
  8. 15. to use something again for a different purpose
  9. 16. the different kinds of animals and plants on earth
  10. 18. reprocessing something to make it new again
Down
  1. 1. people chopping down forests to make houses
  2. 2. the things we use to make life easier
  3. 3. to save something
  4. 6. the act of making something last longer
  5. 8. the gas that insulates our atmosphere
  6. 9. holding something back, or retaining
  7. 11. to use something up
  8. 12. to be able to make something like new
  9. 14. different places where things can live
  10. 17. raw materials used to make things