We must all be responsible twords the planet and there will always be change. Even people's attitude will change in time but I guess it will be too late. Have you seen the film " The Day After Tomorrow", great effects and maybe it made a few people think, even if only for a while.
The very OLDEST (very early) human fossil every found is apox.160,000 years old.
Actaully it was about 150,000 years ago the "modern" human came to be - with our vast intelligence and facial structure we have today. But long before that, at least four million years, "humans" were evolving, walking up-right and gaining brain mass. That is of course if you follow modern ideas of evolution.
Granted, we have only been killing everyone and everything around us for the last couple thousand years so at what point is human human. And what if you do not believe in the theory of evolution, are humans then only 160,000 years old as you say? or are humans only an extension of something more? An eternity, an infinite loop?
"...When a predatory species is introduced into a closed ecological system, the extinction of the weaker species is inevitable..."