1. The earth gives the essence of material to all people, but in the end, the reward it receives from people is the garbage of these materials. ——Whitman

2. The earth provides enough to satisfy everyone’s needs, but not enough to satisfy everyone’s desires. ——Gandhi

3. Nature is a kind and loving mother, but also a cold butcher. ——Hugo

4. If you want to be safe in life, you should have five things: first, clean air; second, clear drinking water; third, drainage ditches; fourth, house sweeping; fifth, sufficient sunlight. ——Nightingale

5. We should not revel in our victory over nature. For every such victory, nature takes revenge on us.

——Engels

6. The result of our violation of nature is that we destroy the beauty of natural landscapes, the beauty of natural dynamics and the beauty of nature.

——Norman Cousins