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3. Energy derived from sources that are naturally replenished.
7. A person who advocates or works for the protection of the environment and wildlife.
8. The protection and preservation of natural resources.
11. The release of gases, such as carbon dioxide, into the atmosphere.
12. The permanent loss of a species from the Earth.
15. A potent greenhouse gas emitted from various sources including agriculture and waste.
17. The natural environment where an organism lives and thrives.
18. Animals living in their natural environment, often referring to non-domesticated species.
20. The variety of life in a particular habitat or ecosystem.

1. The process of replanting trees in a deforested area to restore forest cover.
2. A structure, usually made of glass, used for growing plants or regulating temperature.
4. The policy or action of using vigorous campaigning to bring about political or social change.
5. Remains or traces of ancient life preserved in rocks.
6. Interconnected community of living organisms and their environment.
9. Meeting the needs of the present without compromising the ability of future generations to meet their own needs.
10. The clearing of trees from an area, often for agriculture or development.
13. The study of the ocean, including its physical and biological aspects.
14. A large mass of ice that moves slowly down a mountain or over land.
16. Element essential to life, but excess emissions contribute to climate change.
19. A prolonged period of abnormally low rainfall, leading to a shortage of water.