Climate Change

3. A fuel derived directly from living matter.
5. Resource that can be restored by natural processes.
7. Type of energy obtained by harnessing the energy of the sun's rays.
9. A colorless, odorless gas produced by burning carbon and organic compounds and by respiration.
12. Type of energy generated by radioactive materials.
13. Biological community of interactive organisms.
14. The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
16. Fossil energy source that formed deep beneath the earth's surface.
18. Rainfall made by atmospheric pollution that it causes environmental harm, typically to forests and lakes.
19. Process of converting waste into reusable material.
20. The dying of a species.

1. The variety of life on Earth at all its levels, from genes to ecosystems.
2. A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
4. The heat present in a substance or object.
6. Gases in earth´s atmosphere that trap heat.
8. Resource that cannot be easily replaced by natural means.
10. The action of clearing a wide area of trees.
11. Gradual increase in the overall temperature of the earth atmosphere.
15. Type of energy obtained by harnessing the movement of air.
17. The surroundings or conditions in which a person, animal, or plant lives.