Across
- 4. The power from something to do work
- 5. Converting waste materials into new ones
- 8. Substance produced that is harmful to the environment
Down
- 1. The protection of habitats and ecosystems
- 2. The permanent removal of trees
- 3. Wearing down or damaging of something
- 6. To spread or operate internationally
- 7. Form of energy that can be naturally replenished