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6. Causing disagreement or discussion.
7. The process of planting trees in an area that has not been forested for a long time.
8. The process of deteriorating or being damaged.
11. The protection and preservation of natural resources.
14. At risk of extinction or becoming extinct.
17. Capable of being maintained without harming the environment.
18. The ability to be maintained at a certain rate or level.
19. Native to a particular area or environment.
20. The presence of harmful substances in the environment.

1. The excessive use of resources leading to depletion.
2. The act of cutting down trees in a forest.
3. The act of taking out or removing something, often from the ground.
4. The natural environment where a plant or animal lives.
5. The act of becoming involved in a situation to change its outcome.
9. A community of living organisms and their environment interacting as a system.
10. The process of planting trees in an area where forests have been cut down.
12. The act of returning something to its former condition.
13. The variety of different types of life found in an area.
15. To make something less severe or serious.
16. The process of making an area more urban or city-like.