Across
- 2. Level of the atmosphere which we live in.
- 4. Transforming waste materials into a new product.
- 6. Home to species.
- 9. To maintain in its current state.
- 11. Gases put into the atmosphere by industrial processes, energy generation and vehicle usage, to name a few.
- 12. The study of organisms' relationships with their ecosystem.
Down
- 1. Process which light is converted into chemical energy.
- 3. No longer a species.
- 5. Released by landfills, fossil fuel extraction and dairy farms.
- 7. Decayed organic matter.
- 8. Not for single-use.
- 10. Heat-trapping greenhouse gas.