Is it possible that the changes in the climate are more linked to an end of geologycal era than to the human act? I mean, the change in the pattern of the flight from some type of birds, that localize themselves by magnectic field is an evidence that the magnetic poles are inverting themselves, and this could be the responsible for this behaviour change in these birds. An inversion in the magnectic poles is imposible to be induced by humans, and it is a common change that occurs from time to time in each era, don’t? The melting of glaciers are common either in the end of eras, don’t?