"Plans to protect air and water, wilderness and wildlife are in fact plans to protect humans. "
-Stewart Udall
That quotation is true. Diversity in this planet is important and every living and non-living thing play a huge part .
Protecting our nature is important simply because for our own sake. Maybe if you analyze it very well you'll understand why. It's like a domino effect. The absence of one thing will lead to extinction of the other one until no one left.
Like the absence of trees will lead to heavy flood that may affect the habitats of animals and lead to their death. And what's next, people also will suffer.
Protect the nature. Don't wait the worst before you act. In your simple way, you can help.