Here are some lines about the environment:

1. "The earth has enough resources for our need, but not enough for our greed."

2. "Nature is not a place to visit, it's home."

3. "We do not inherit the earth from our ancestors, we borrow it from our children."

4. "The environment is not a luxury, it's a necessity."

5. "Save the earth, it's the only home we have."

6. "Reduce, Reuse, Recycle - Every small action counts."

7. "The future of the earth is in our hands."

8. "Let's go green, for a better tomorrow."

9. "Environmental protection is everyone's responsibility."

10. "Small changes today, a better world tomorrow."