Across
- 3. burning these speed the global warming
- 7. also one of the main greenhouse gases
- 8. most of this comes to Europe from Russia
- 9. this might happen when it's stormy
- 10. this is one of the main greenhouse gases
- 12. this is formed in swamps
Down
- 1. this is more acid than usual rain
- 2. if we use nuclear energy, we need these
- 4. this is very harmful to the environment and it can happen if there's an accident on the oil rig
- 5. these can be found on the roofs
- 6. for example wind power and solar energy
- 11. for example phones work with this