Match the words on the left with their definitions on the right. Write the letters in the boxes. 1. acid rain 2. biodegradable 3. biodiversity 4. carbon monoxide 5. climate 6. deforestation 7. desertification 8. disposable product 9. endangered species 10. fumes 11. global warming 12. natural resources 13. renewable energy 14. oil spill 15. ozone layer 16. pollution 17. recycle 18. tsunami 19. volcano 20. waste