Across
- 3. formed in the geological past
- 5. what's left after use
- 6. polluting substance
- 8. saving energy
- 9. using wind power
- 10. green
- 11. to use again
- 12. uses solar power
- 13. causes global warming
- 15. water shortage
- 16. electricity
- 17. the consequence of cutting trees
Down
- 1. environmental, economic and social approach to development
- 2. pollution
- 4. reduction in quantity
- 7. can be produced as quickly as it is used
- 14. the CO2 emissions generated by a person or activity