Happy Earth Month!

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Across
  1. 4. to use less
  2. 5. grown without the use of human-made materials
  3. 7. trash in a public place
  4. 8. converts waste into reusable material
  5. 9. something that is planted on earth day
  6. 13. state of net-zero carbon dioxide emissions (two words)
  7. 16. able to be maintained
  8. 18. to contaminate
  9. 19. to use again
  10. 20. what to do with leftover food
Down
  1. 1. to protect from harm
  2. 2. tiny bits of plastic that pollute oceans
  3. 3. color you commonly see during Earth Month
  4. 6. energy not depleted by use
  5. 10. planet we live on
  6. 11. goal of sending nothing to a landfill (two words)
  7. 12. from a source that is not depleted when used (two words)
  8. 14. reused discarded material or objects
  9. 15. the goal of Earth Month is to protect the _____
  10. 17. coal, oil, and natural gas (two words)