Environment

5. able to decay naturally and in a way that is not harmful.
10. the cutting down of trees in a large area , or the destruction of forests by people.
11. the average height of the sea which increases in recent years.
12. to catch and kill animals without permission on someone else's land.
13. the state of having no food for a long period, often causing death.
15. a situation in which something no longer exists.

1. the power produced when the nucleus (= central part) of an atom is divided or joined to another nucleus
2. causing, or made in a way that causes, little or no damage to the environment and therefore able to continue for a long time.
3. a fire burning in an area of land with many trees, that is difficult to control and sometimes spreads quickly.
4. to cause to fill or become covered with water, especially in a way that causes problems.
6. a gas that causes the greenhouse effect, especially carbon dioxide.
7. changes in the world's weather, as a result of human activity
8. energy that is produced using the sun, wind, etc., or from crops, rather than using fuels such as oil or coal.
9. dioxide the gas formed when carbon is burned, or when people or animals breathe out.
14. the time at which a change or an effect cannot be stopped.