Environmental issues

2. a lack of food during a long period of time in a region
5. the state in which somebody suffers or dies because they have no food
8. a person (especially a man) in your family who lived a long time ago /ancestor/
10. an island made of coral and in the shape of a ring with a lake of seawater (called a lagoon) in the middle
12. the act of cutting down or burning the trees in an area
13. that you cannot avoid or prevent
14. the process through which heat is trapped near Earth's surface by substances known as 'greenhouse gases.

1. to make a substance or place dirty or no longer pure by adding a substance that is dangerous or carries disease
3. with no people living there
4. to move out of or away from something and become possible to see
6. reduction in the concentration of ozone in the ozone layer.
7. water that is found under the ground in soil, rocks, etc.
9. a serious disease caught from bacteria in water that causes severe diarrhoea and vomiting and often causes death
11. the state of being poor