Across
- 7. Type of waste that rots naturally
- 10. Smoke and dirt in the air
- 11. A renewable energy source from the sun
- 13. The planet we live on
- 14. Water that falls from clouds
- 15. Decayed organic matter used as fertilizer
- 17. Opposite of "recycle"
- 18. Natural fuel made from decomposed plants and animals
- 20. Melting of polar ___ due to climate change
- 22. Pollution in the seas and rivers
- 23. Animals living in nature
- 26. Area covered mainly by trees
- 27. To plant trees again
Down
- 1. Rubbish thrown in public places
- 2. Remains of ancient plants and animals
- 3. A large body of saltwater
- 4. Animals or plants in danger of disappearing
- 5. Frozen water on mountains
- 6. Color of recycling bins for paper
- 8. WARMING Heating of the Earth due to gases
- 9. A non-biodegradable waste material
- 12. A glass building for plants, also linked to gases
- 16. Gas that plants release during photosynthesis
- 19. A container for garbage
- 21. Type of waste that includes plastics and metals
- 22. Type of energy from moving air
- 24. Power that can be renewable or non-renewable
- 25. A plant that absorbs carbon dioxide
- 28. The layer that protects Earth from UV rays