Across
- 2. to make something less pure or make it poisonous
- 4. an increase in the amount of carbon dioxide and other gases in the atmosphere (2 words)
- 8. the activity of cutting down trees in order to use their wood
- 9. removal of everything that is not wanted from an area (2 words)
Down
- 1. a situation in which something no longer exists
- 3. using methods that do not harm the environment
- 5. having no protection
- 6. to make sth become less
- 7. animals and plants that grow independently of people, usually in natural conditions
- 10. to get rid of something unwanted, especially by leaving it in a place where it is not allowed