Saving rainforests

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Across
  1. 2. praise
  2. 5. a specific type of woodland area
  3. 7. to offer to do something of one's own will
  4. 9. synonym for essential
  5. 12. having an obligation to do something
  6. 14. to do with the whole world
  7. 15. a word associated with farming
  8. 16. to try to reach agreement; to bargain
Down
  1. 1. river with the most water in the world
  2. 3. the material needed to do a task
  3. 4. to clear an area of forest
  4. 6. kept or held in position
  5. 8. synonym for increasing
  6. 10. able to keep something at a fixed level without exhausting the environment
  7. 11. the full number of people who live in a place
  8. 12. acting on behalf of someone else
  9. 13. a society or a business
  10. 17. a slow wearing away of something