In order to prevent further degradation of nature, we can all simply consume fewer resources. Though no one person can make a huge difference on his or her own, if everyone does a few little things, it can add up to many fewer resources used.
For example, we can cut back on our driving. There are many people in the US who will drive two or three blocks to do things like picking their kids up from school. There are high school students who will drive a few blocks to get to school.
We can also watch our energy consumption at home. Many people keep their thermostats turned way down in the summer and way up in the winter. They use much more energy than they would need to in this way.
Finally, we are a very "disposable" culture. We buy things like apples that are presliced and wrapped in plastic boxes rather than buying whole apples that come with no packaging. We could avoid buying things like that which use resources for the sake of a tiny bit of convenience. We could also, at the very least, recycle those things that we do buy rather than throwing them away. These are all steps we can take to prevent further degradation of nature.