extinction increases with warming in all climate change projections, for all native species studied in biodiversity hotspots , being roughly threefold greater for endemic than more widespread species for global warming of 3ºC above pre- industrial levels than 1.5℃)  . The Arctic is projected to be practically ice free in September in some years for global warming of between 1.5℃ and 2ºC , undermining the persistence of ice-dependent species such as polar bears, ringed seals and walrus , and adversely affecting Indigenous communities. Warming of 1.5℃ is also assessed  to reduce the habitability of small islands, due to the combined impacts of several key risks . Hence, the transition from high to very high risk in these systems is assessed to occur with high confidence beginning at 1.2°C, passing through a median value of 1.5°C, and completing  at 2°℃ warming.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report