Industrial processes, the consumeristic way of life, the garbage that is created from that and the blatant disregard for other life forms who share this planet all contribute to decimating the natural world. Caretaking involves helping to heal those parts of the Earth that have been damaged and destroyed by these factors. The task seems monumental, but because of this there are literally thousands upon thousands of ways that we can help. There are still undamaged, wild, natural areas left on this planet. It seems that these are getting to be very few and far between.
Air pollution has touched every part of the Earth, acid rain has as well.
If you consider that, then no area is any longer wild or natural. In any case, these remaining areas need protection from the ravages of the modern industrial machine. Again, there are many many ways to help. Well, assuming that humans did not arrive from another planet, then we belong here. Depending on your point of view, either we evolved here out of other life forms, or we were at some point created here by some higher force.