friendly. (environment) 11. One ton of recycled paper saves 12. Contact an organization like Friends of the Earth for eight trees. (approximate) (inform) 13. The milkman often the empty bottles of milk. (collection) 14. Tires can be recycled to make pipes or floor 15. My friend Tom has a great (cover) of coins. (collect) ? (environmental) natural fertilizer is compost. (wonder) 16. Do you know how to protect the 17. The most 18. They talk about their plan 19. Farmers often use dung for .(happy) their fields. (fertilizer) 20. I'm in collecting waste paper.(interest)