Extinction of species is an irreversible impact of climate change, with increasing risk as global temperatures rise . The median values for percentage of species at very high risk of extinction  are 9% at 1.5℃ rise in GSAT, 10% at 2°C, 12% at 3.0°C, 13% at 4°C and 15% at 5℃ , with the likely range of estimates having a maximum of 14% at 1.5°C and rising to a maximum of 48% at 5℃ . Among the groups containing the largest numbers of species at a very high risk of extinction for mid-levels of warming  are: invertebrates , amphibians  and flowering plants . All groups fare substantially better at lower warming of 2ºC, with extinction projections reducing to <3% for all groups, except salamanders that reduced to 7%  . Even the lowest estimates of species' extinctions  are 1000 times the natural background rates. Projected species' extinctions at future global warming levels are consistent with projections from AR4, but assessed for many more species with much greater geographic coverage and a broader range of climate models. 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report