We are in the century of mass extinctions made worse by humans. Irrelevant what caused the climate to change, but absolutely no doubt land clearance/ habitat destruction/ degraded Earth with poisons etc has removed areas of Nth/ Sth passages which would have allowed the movement for migration of all species (Flora and Fauna) to find their new niches in the new climatic conditions.
The mass extinction will be far worse because of human activity, largely done after the industrial revolution.

@Druvius Send him a copy of Merchants of Doubt.

@Druvius You are wrong..... every 125,000 years the ice melts. That is called science... Derived from examination of 1.5 million years of ice core samples....Please read some research about these conclusions. Lots of real science papers.

50 million years ago, there was NO ice for millions of years... Humans did not do that.

The ice caps have only been around for about 3.5 million.

Did humans accelerate the current melting? Not easy to determine when too many have already closed their minds to reality.....

This is all perty much like all the lefters demanding we believe men can become women just by clicking their little heels together and saying the magic words, "i am a woman".....