Across
- 2. A renewable form of energy can be produced as quickly as it.
- 4. involving people working together.
- 7. a measurement of the amount of carbon dioxide.
- 9. farming.
- 10. the same colour as grass.
- 12. a situation that causes difficulties.
- 13. relating to the energy.
Down
- 1. not producing carbon emissions.
- 3. one of two or more things that you can choose between.
- 5. connected with the heat inside the earth.
- 6. someone uses something.
- 8. making or growing something.
- 11. the power to be very active.