Across
- 5. to keep something in its original state
- 6. a measurement of the amount of carbon-dioxide a person adds to the atmosphere
- 8. carrying harmful bacteria or toxins that can cause disease or death
- 11. no longer existing or lost forever (of an animal, bird or plant species)
- 14. the planting of trees and plants to help a damaged or destroyed forest recover
- 18. complex system of relationships between living things and their environment
- 19. to make something new from materials that have been used before
- 20. to release or project something (eg. light, sound, smoke, gas, radiation, etc.)
- 22. to use more than necessary, or to use inefficiently
Down
- 1. rain that contains harmful chemicals
- 2. the protection and preservation of natural environments and resources
- 3. releasing no greenhouse gases like carbon-dioxide or methane
- 4. to put waste in the wrong place
- 7. to use again
- 9. dangerous substances that need careful disposal (eg. toxic or nuclear waste)
- 10. a gas in the atmosphere that stops heat from escaping into space
- 12. to use things like energy, fuel, materials, food, water, etc.
- 13. to reduce as much as possible
- 15. a chemical that's sprayed on crops to stop insects from destroying them
- 16. a substance or material that damages the natural environment
- 17. can be used without running out, esp. of energy sources like solar and wind
- 21. to share a car instead of driving one alone