In AR5, the transition from moderate to high risk was assessed to occur between 1.6°C and 2.6°C above the pre-industrial levels with medium confidence. In SR15, new literature on projected risks allowed this range to be narrowed to 1.5-2ºC. There is now substantial literature providing robust evidence of larger regional risks at 2℃ warming than 1.5℃ and in a range of systems, including crop production  , aquaculture and fisheries ,
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report