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Across
  1. 1. Wind-powered device
  2. 5. Breathing process
  3. 6. Tree planting
  4. 8. One benefits, one unaffected
  5. 10. Large ecosystem
  6. 12. One benefits, one harmed
  7. 13. Survival trait
  8. 14. Nitrogen movement in nature
  9. 16. Heat retention
  10. 17. Resource protection
  11. 21. Seasonal movement
  12. 22. Mutual benefit relationship
  13. 23. Forest regrowth
  14. 24. Sun-powered device
Down
  1. 2. Forest clearance
  2. 3. Soil loss
  3. 4. Plant energy production
  4. 7. Long-term viability
  5. 9. Both benefit relationship
  6. 11. Earth's water movement
  7. 15. Carbon movement in nature
  8. 18. Replenishable energy
  9. 19. Rotating energy generator
  10. 20. Natural, not synthetic