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