Well, a beaver dam helps the natural environment by creating water habitats for other creatures. Humans create chemicals that don’t break down forever, plastics that break down over centuries that include microplastics that are now in our bloodstreams and in in whales stomachs. Does any of that human stuff sound like it is natural?
I’m not saying every part of humanity is bad. Certain parts definitely are and while nature will adapt to some of it, but we are on pace to drive many species to extinction. For all the successful adaptation to our actions the are hundreds and hundreds that don’t and if we do that to enough keystone species then the ecosystem could collapse.