Across
- 5. in danger of being harmed, lost, unsuccessful, etc
- 6. pollution harmful substances in the air, often consisting of waste
- 7. the protection of plants and animals, natural areas
- 9. all the living things in an area and the way they affect each other and the environment
Down
- 1. animals and plants that grow independently of people, usually in natural conditions
- 2. change changes in the world's weather
- 3. footprint a measurement of the amount of carbon dioxide that their activities produce.
- 4. a very large city, especially one with more than 10 million people living in it
- 8. able to continue over a period of time