Climate change actually boosts human evolution as it forces us to move to new areas and work together

Daily Mail
"The first began around two million years ago when a prolonged dry period caused forests to disappear leading to the emergence of Homo erectus - an early human adapted to running and hunting on the grassy plains. During the ice age,Neanderthals thrived in Europe, Denisovians in Asia and modern humans in Africa
During the ice age, Neanderthals (above) thrived in Europe, Denisovians in Asia and modern humans in Africa. The next major development came during the ice age which began 450,000 years ago during which scientists believe human beings were split into three separate groups. European humans evolved into Neanderthals while Asian humans evolved into Denisovans. Those remaining on the African subcontinent evolved into modern human beings but this group had to wait until around 60,000 years ago when a prolonged warm spell allowed them to spread north. Then a sustained cold period between 25,000 and 15,000 years ago caused further changes as the freezing temperatures caused a 330ft drop in sea levels allowing humans to cross the Bering land bridge into North America."