Across
- 3. chemicals used to make plants and vegetables grow faster
- 7. development which does not completely use up or destroy natural resources
- 9. a synonym of ecological
- 10. If they disappear, the fish can no longer live
- 11. you can get electricity from this natural source of energy
- 12. a fossile source of energy that we use for our cars
- 14. gases which warm the atmosphere of the earth
Down
- 1. the act or result of cutting down or burning all the trees in an area
- 2. the worst pollution for the seas and oceans
- 4. the opposite of fossile
- 5. a fossile source of energy whose colour is black
- 6. a gas which comes from cars and industries and which pollutes the earth
- 8. they can produce geothermal energy
- 13. not used in green agriculture