Earth Day

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