Across
- 5. gases ejected from from an engine
- 8. serious changes in the weather conditions
- 9. to know about
- 11. a series of operations to complete a goal
- 14. to improve the situation
- 15. food remaining from a previous meal
- 16. a small amount of sth
- 17. make less waste
Down
- 1. items of unwanted trash
- 2. no longer exist or live
- 3. a machine used in a house
- 4. rain with dangerous chemicals
- 5. species any tyle od plant or animal that is in danger of disappearing forev er
- 6. to pollution
- 7. the increase in the earth's temperature
- 8. chop trees down
- 10. coal, oil, gas
- 12. the contamination of the atmosphere
- 13. to affect or change sth