Environment vocabulary

2. (adj) possible and likely to be achieved
5. (adj) necessary or essential in order to succeed or exist
7. (n) the number and types of plants and animals that exist in a particular area
9. (adj) having a helpful or useful effect
10. (v) make something less pure or make it poisonous
13. (adj) producing no useful results
14. (n) gas, etc. that is sent out into the air
16. (n) a long period of time when there is little or no rain

1. (adj) worth spending time, money or effort on
3. (n) all the living things in an area and the way they affect each other and the
4. (adj) causing little or no damage to the environment
6. (v) be a danger to something or somebody
8. (adj) causing a lot of damage and destruction
11. (adj) that cannot be changed back to what it was before
12. (n) waste gases that come out of a vehicle
15. (adj) that cannot be solved