environment

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Across
  1. 2. ... One of the 3Rs — to produce less waste.
  2. 3. ... Natural area dominated by trees.
  3. 5. ... Layer of gases around Earth.
  4. 8. ... Growing plants without soil (short form).
  5. 10. ... Removal of trees, often for timber.
  6. 12. ... Sudden large growth of algae (algal ___).
  7. 15. ... Using resources so future generations can also use them.
  8. 16. / Down (20)
  9. 17. ... Protected land for wildlife (National ___).
  10. 20. ... Materials that can be processed and used again.
  11. 22. ... Action of saving energy or resources.
  12. 23. ... Substance that cannot be naturally decomposed.
  13. 27. ... Gas mainly responsible for global warming (from fuels).
  14. 29. ... Harmful substance that contaminates environment.
  15. 30. ... Action to lessen climate change impacts.
  16. 33. ... Fuel formed from ancient organic matter.
  17. 36. ... Top surface layer of the Earth.
  18. 37. ... Natural home of a species.
  19. 38. / Across (20)
  20. 40. ... Thick frozen water at poles.
  21. 41. ... Energy generated by moving air.
Down
  1. 1. ... Place where organic waste is converted to soil.
  2. 2. ... Replanting trees where forests were cut.
  3. 4. ... Managing and protecting water resources.
  4. 6. ... Microscopic photosynthesizing organisms in water.
  5. 7. ... Process where water enters the soil.
  6. 9. ... Long-term rise in average Earth temperature.
  7. 11. ... Reusing items for new purposes.
  8. 13. ... Movement of organisms to new areas (often human-caused).
  9. 14. ... Species that no longer exist.
  10. 18. ... Human relocation due to climate impacts.
  11. 19. ... Process plants use to make food from sunlight.
  12. 21. ... Measurement of total greenhouse gases from person/product.
  13. 24. ... Liquid that falls from clouds.
  14. 25. ... Vehicle that can run on electricity (short).
  15. 26. ... Variety of life across species and ecosystems.
  16. 28. ... Large salt water body.
  17. 31. ... Any dirty or harmful emission to the air.
  18. 32. ... Chemical used to kill pests (can harm non-targets).
  19. 34. ... Rules/acts protecting nature.
  20. 35. ... Power or radiation from the sun.
  21. 39. ... Marine animals’ limestone structures.