Environment

2. a long period when there is little or no rain
4. a substance that is used to provide heat or power, usually by being burned
5. catching too many fish in an area of the sea, so that there are not many fish left there
6. a substance that pollutes
7. the process of getting rid of large amounts of rubbish by burying it, or a place where rubbish is buried
9. unwanted matter or material of any type, especially what is left after useful substances or parts have been removed
10. all the living things in an area and the way they affect each other and the environment
12. damage caused to water, air, etc. by harmful substances or waste:

1. not harmful to the environment, or trying to help the environment:
2. the cutting down of trees in a large area, or the destruction of forests by people:
3. warming a gradual increase in world temperatures caused by gases such as carbon dioxide that are collecting in the air around the earth and stopping heat escaping into space
8. a thick layer of ice that permanently covers an area of land
11. a mixture of smoke, gases, and chemicals, especially in cities, that makes the atmosphere difficult to breathe and harmful for health