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."