TS.C.1.2 Risks to ecosystem integrity, functioning and resilience are projected to escalate with every tenth of a degree increase in global warming . Beginning at 1.5℃ warming, natural adaptation faces hard limits, driving high risks of biodiversity decline, mortality, species extinction and loss of related livelihoods . At 1.6°C , >10% of species are projected to become endangered, increasing to >20% at 2.1ºC, representing severe biodiversity risk . These risks escalate with warming, most rapidly and severely in areas at both extremes of temperature and precipitation . With warming of 3ºC, >80% of marine species across large parts of the tropical Indian and Pacific Ocean will experience potentially dangerous climate conditions . Beyond 4℃ warming, projected impacts expand, including extirpation of approx. 50% of tropical marine species  and biome shifts  across 35% of global land area . These will lead to a shift of much of the Amazon rainforest to drier and lower-biomass vegetation , poleward shifts of boreal forest into treeless tundra across the Arctic and upslope shifts of montane forests into alpine grassland
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report