Across
- 3. They are the gases in the atmosphere that rise the temperature on Earth
- 6. Many animals, for example dodos are already..... and we can't meet them anymore.
- 7. ............ species are animals in serious danger of dying out.
- 8. These sources of energy are natural and can be used over and over again.
Down
- 1. exhaust........ pollute our cities due to heavy traffic
- 2. We need to protect the.......... if we don't want a serious climate change to happen.
- 4. ...... is liquid pollution, but it should never be dumped into rivers.
- 5. They are the places our waste ends up in.