Climate change: global reshuffle of wildlife will have huge impacts on humanity | This mass movement of species is the biggest for about 25,000 years, the peak of the last ice age, say the scientists, who represent more than 40 institutions around the world.

See the source article by following the link below:
Climate change: global reshuffle of wildlife will have huge impacts on humanity | This mass movement of species is the biggest for about 25,000 years, the peak of the last ice age, say the scientists, who represent more than 40 institutions around the world.