In AR6, risks are considered to start to transition from high to very high risks above 1.2°C warming , with a median value of 1.5ºC, owing in particular to the observation of a present-day onset of ecosystem degradation in coral reefs, which are projected in the SR15 report 'to decline by a further 70-90% at 1.5℃ ' . The literature for projected increases in risk to other unique and threatened systems and their limited ability to adapt above 2°C warming is substantial and robust, and the confidence level in very high risk remains high. At 2ºC, 18% of 34,000 insects are projected to lose >50% climatically determined geographic range, as compared with 6% at 1.5℃ . The risk of species
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report