The environment-animal conservation

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Across
  1. 4. A poisonous substance that damages health or the environment.(two words)
  2. 7. To reduce as much as possible
  3. 9. To destroy a forest by cutting down all the trees
  4. 15. Energy that is produced using sun, wind, etc., or from crops, rather than using fuels such as oil or coal.(two words)
  5. 16. To share a car instead of driving one alone.
  6. 19. To become less or to make something become less.
  7. 21. The act of keeping something the same or of preventing it from being damaged.
  8. 24. The activity of of making new furniture, objects, etc. out of old or used things or waste material.
  9. 26. The protection of wild animals from the damaging effects of human activity.(tow words)
  10. 28. To use more than necessary, or to use inefficiently.
  11. 30. A measurement of the amount of carbon dioxide a person adds in the atmosphere.
  12. 31. Using double-glazed windows to keep houses warm in the winter and cool in the summer-insulating the exterior of the house will save energy.(two words)
  13. 33. The complex system of relationships between living things and their environment.
Down
  1. 1. The order in which organisms in an ecosystem eat one another(two words)
  2. 2. A gas that's released when carbon is burned or when people or animals breathe out.(two words)
  3. 3. Use public transport or electrical cars.
  4. 5. The natural environment in which an animal or plant usually lives.
  5. 6. Which are the three Rs?(three words)
  6. 8. The gradual increase in world temperatures that is caused by high levels of carbon dioxide emissions.(two words)
  7. 10. The fact of a person, organization, etc. continuing to live or exist.
  8. 11. Rain that contains amounts of harmful chemicals as a result of burning substances such as coal and oil.(two words)
  9. 12. Damage caused to water, air, etc. by harmful substances or waste.
  10. 13. To continue to exist when other parts or things no longer exist.
  11. 14. The act of collecting and storing plant material so it can decay and be added to soil to improve its quality.
  12. 17. An area of land kept in its natural state, especially for wild animals to live in and be protected.
  13. 18. To give money or goods to an organization you want to help or support.
  14. 20. The feature of the wwf (World Wide Fund for Nature) symbol.
  15. 22. The fact of something or someone existing.
  16. 23. To chase and try to catch and kill an animal or bird for food, sport or profit.
  17. 25. Not allowed by law.
  18. 27. To become smaller in size, amount, degree, importance, etc.
  19. 29. ...animals-that are threatened with extinction as a result of human activity
  20. 32. A thick dirty cloud at ground level caused by pollutants react to the sunlight.