Across
- 1. warming The gradual increase in the Earth's average temperature due to human activities.
- 3. dioxide A gas that contributes to the greenhouse effect and global warming.
- 6. A type of energy that is a renewable resource.
- 7. The practice of using resources wisely and in a way that conserves them for future generations.
- 8. A natural home or environment of an animal, plant, or other organism.
Down
- 2. The variety of life within an ecosystem.
- 3. The process of turning waste into reusable material.
- 4. The contamination of air, water, or soil
- 5. elephant A species that is at risk of extinction.