1. "Save water, please."

2. "Care for the environment!"

3. "Don't litter the ground."

4. "Keep our surroundings clean."

5. "Plant trees and flowers."

6. "Reduce, reuse, recycle."

7. "Use less plastic."

8. "Conserve energy."

9. "Protect wildlife."

10. "Every little action counts."

这些句子简洁明了，适合用于提醒人们保护环境。