Earth Day and Sustainability Crossword Puzzle

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Across
  1. 3. Maintain over time
  2. 5. Community of organisms and their environment
  3. 8. Measure of environmental impact
  4. 9. Natural material
  5. 11. Turn waste into reusable material
  6. 12. Energy that naturally replenishes
  7. 15. Use items again
Down
  1. 1. Common pollutant
  2. 2. Element in emissions
  3. 4. Energy from the sun
  4. 6. Protect resources
  5. 7. Prefix meaning environmentally friendly
  6. 10. Power used daily
  7. 13. - Fuel from organic matter
  8. 14. Use less