Unit 9

5. The release of gases or other substances into the air
6. The variety of plant and animal life in a particular habitat or in the world
10. Energy that comes from a source and travels through space, which can be in the form of waves or particles
12. The clearing or thinning of forests by humans
13. A fixed share or limit that a person or group is entitled to receive or is bound to contribute
17. The trapping of the sun's warmth in the Earth's lower atmosphere, caused by the presence of greenhouse gases like CO2
19. A community of living organisms and their physical environment interacting as a system
20. Gases in the Earth's atmosphere that trap heat, such as carbon dioxide, methane, and nitrous oxide

1. The total amount of greenhouse gases (including CO2) that are emitted by our actions
2. Energy released during nuclear reactions, such as fission or fusion, used to generate electricity
3. The protection and preservation of natural resources and the environment.
4. Able to be maintained at a certain rate or level without depleting (consuming) resources or harming the environment.
7. A group of wind turbines in the same location used to produce electricity
8. A colorless gas produced by burning carbon and organic compounds and by respiration. It is absorbed by plants in photosynthesis
9. Energy from the sun that is converted into thermal or electrical energy
11. Contamination of the air by harmful substances like smoke, dust, and chemicals
14. Long-term changes in temperature, precipitation, and other atmospheric conditions on Earth
15. Not harmful to the environment.
16. A facility where electrical power is generated
18. Capable of being broken down by natural processes, such as by bacteria or other living organisms.