Happy Earth Day!

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Across
  1. 4. a large area covered chiefly with trees and undergrowth.
  2. 7. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
  3. 8. capable of being decomposed by bacteria or other living organisms.
  4. 11. make smaller or less in amount, degree, or size.
  5. 12. use again or more than once.
  6. 13. woody perennial plant, typically having a single stem or trunk growing to a considerable height and bearing lateral branches at some distance from the ground.
Down
  1. 1. a colorless, transparent, odorless liquid that forms the seas, lakes, rivers, and rain.
  2. 2. maintain (something) in its original or existing state.
  3. 3. trash, such as paper, cans, and bottles, that is left lying in an open or public place.
  4. 5. a colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.
  5. 6. the fourth month of the year.
  6. 9. the surroundings or conditions in which a person, animal, or plant lives or operates.
  7. 10. convert into reusable material.