the environment

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