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Across 4. The opposite of 'dirty' 8. The act of cutting down all trees 9. Opposite to fast food: .... food. 11. ....layer that protects us 14. When old materials are used to create something new 16. To keep safe 17. Not a river 19. Water, land, air, noise... 20. Global ...

Down 1. Transport that can fly 2. The coldest continent 3. The Pacific ... 5. Everything that is around us 6. Something that you throw away 7. A large wave 10. we need it to breathe 12. The name of our planet. 13. A system that connects everything alive on our planet. 15. Colour of save energy 18. The smallest bird