climate change

2. fuel that is developed from organic materials,
5. a binary compound of oxygen with another element or group.
6. a substance that pollutes something, especially water or the atmosphere.
9. the chemical element of atomic number 16, a yellow combustible nonmetal.
10. the supply of water to land or crops
11. the process of eroding or being eroded by wind, water, or other natural agents.
15. the gas that cause the greenhouse effect
18. practice of farming
19. smoke and fog
20. (of soil or land) producing or capable of producing abundant vegetation or crops.

1. the inhabitants of a place
3. deposits of organic materials, formed from decayed plants and animals
4. chemical compounds that are used to kill pests
7. a layer in the atmosphere that is man made
8. the amount of humans that the earth can support
12. water found underground
13. a type of vaporization
14. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
16. a period of severe dust storms that greatly damaged the ecology and agriculture
17. the draining away of water