In nature everything is interconnected, and if you remove one chain link ( in this case forest) it can hurt many animals. for example birds. many of them build nests in trees, woodpeckers will not be able to eat (because they eat harmful insects), many species of insects will die, as the beetle feeds on the bark of trees. and most importantly, no trees can live for the man himself, as in the course of photosynthesis, trees absorb carbon dioxide and produce the oxygen we breathe. and we will not have paper(since it is obtained from wood). therefore, it was not in the place where we cut down trees and forests, we must plant new, to on to fill the balance of nature!