Early human evolution  occurred in a highly variable climate characterised by glacial-interglacial cycles. This variability may have favoured key hominin adaptations such as bipedality, increased brain size, complex sociality, and more diverse tools  , but extinctions of five species of Homo have also been attributed partly to climate change  . The 'out-of-Africa' dispersal of anatomically modern humans may have been driven by climate variability  . Most late Pleistocene megafaunal extinctions are attributed to direct and indirect human impacts , although some were likely accelerated by climate change  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report