Climate Change

2. Type of energy generated by radioactive materials.
4. Resource that cannot be easily replaced by natural means.
6. Gases in earth´s atmosphere that trap heat.
7. The variety of life on Earth at all its levels, from genes to ecosystems.
12. Fossil energy source that formed deep beneath the earth's surface.
13. The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
14. A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
15. Type of energy obtained by harnessing the energy of the sun's rays.
18. The dying of a species.
19. Gradual increase in the overall temperature of the earth atmosphere.
20. Type of energy obtained by harnessing the movement of air.

1. The action of clearing a wide area of trees.
3. A colorless, odorless gas produced by burning carbon and organic compounds and by respiration.
5. Biological community of interactive organisms.
8. Resource that can be restored by natural processes.
9. The heat present in a substance or object.
10. Process of converting waste into reusable material.
11. Rainfall made by atmospheric pollution that it causes environmental harm, typically to forests and lakes.
16. The surroundings or conditions in which a person, animal, or plant lives.
17. A fuel derived directly from living matter.