I think that the earth has always been changing. When human
being did not exist many millions of year ago, it had been changing. We
will not argue that the disappearance of dinosaurs is due to human
activities, yet they are extinct. Therefore, I think that our species is
not to blame because it is itself victim of a cosmic system and change
that even existed before him. Perhaps the extension of species living on
earth is a phenomenon that cannot be reversed.