Across
- 2. to make something new from materials that have been used before
- 6. higher air and sea temperatures partly caused by man-made increases in greenhouse-gas levels
- 7. a fuel like oil or coal formed from very old plant and animal fossils
- 14. a gas that's released by plants and by burning fossil fuels
- 16. a poor nation that's gradually becoming richer and more advanced
- 17. a gas in the atmosphere that stops heat from escaping into space
- 18. to put organic waste like vegetable peels, uneaten food, grass clippings and leaves into a large container that breaks it down into healthy soil
- 19. a thick dirty cloud at ground level caused by pollutants reacting to sunlight
Down
- 1. animals, birds, insects, etc. living naturally in the wild
- 3. global changes in temperature, wind patterns, rainfall, etc.
- 4. a measurement of the amount of CO2 a person adds to the atmosphere
- 5. the contamination of the environment
- 8. animals or plants in danger of becoming extinct or disappearing in the near future
- 9. can be used without running out, esp. of energy sources like solar and wind
- 10. rubbish or garbage from a house or apartment
- 11. a forestry or logging practice in which most or all trees in an area are cut down
- 12. the order in which organisms in an ecosystem eat one another
- 13. rain that contains harmful chemicals that collect in the atmosphere when fossil fuels are burned
- 15. the planting of trees and plants to help a damaged or destroyed forest recover