Environment by mekyle nazarko

2. the purposeful clearing of forested land.
5. a person who advocates or acts for the protection and preservation of the environment and wildlife.
9. the action or state of making or being made impure by polluting or poisoning.
11. (of a substance or object) capable of being decomposed by bacteria or other living organisms.
13. made from decomposing plants and animals.
14. a layer of gas or layers of gases that envelope a planet, and is held in place by the gravity of the planetary body.
16. a polluting or poisonous substance that makes something impure.
18. intended to be used once, or until no longer useful, and then thrown away.
20. a colorless, highly poisonous, odorless, tasteless, flammable gas that is slightly less dense than air.

1. is the place or environment where a plant or animal naturally or normally lives and grows
3. the production and discharge of something, especially gas or radiation.
4. the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
6. when species are diminished
7. the variety of life in the world or in a particular habitat or ecosystem.
8. the strength and vitality required for sustained physical or mental activity.
10. the average weather in a given area over a longer period of time.
12. prevention of wasteful use of a resource.
15. the surroundings or conditions in which a person, animal, or plant lives or operates.
17. a biological community of interacting organisms and their physical environment.
19. heat within the earth