1. Protect the environment

2. Save energy

3. Cut down trees

4. Form good habits to protect the surroundings

5. Take active measures to protect rare animals

6. Save our sea

7. Keep the environment clean, so it will stay green

8. Keep our nature healthy, cause it will make us wealthy

9. Reduce wastes and recycle them instead, put them with plants and they will be fed

10. Global warming is so uncool!

11. Save our precious Earth!

12. Clean & live, or be lazy & die!

13. Create a green campus, start with you and me

14. Don't let the dust get into the campus, just let it be good to my house

15. Bring the green into the campus

16. Love at the foot of the grass, not folds flower

17. We grew up with the tree!

18. Let the campus be a green palace!

19. Environmental protection regardless of nationality, ecology without borders

希望这些标题能够满足您的需求。