In 2015, the Paris Agreement established the goal of 'holding the increase in the global average temperature to well below 2℃ above pre-industrial levels and pursuing efforts to limit the temperature increase to 1.5ºC above pre-industrial levels'. However, assessment of key risks across a range of future warming levels remains a high priority for several reasons:  understanding risks at higher levels of warming can help prepare for them, should efforts to limit warming be unsuccessful ;  understanding risks at higher levels can inform the benefits of limiting warming to lower levels;  in addition, there is continued debate about whether warming limits should be at or rather somewhere below 2℃ ; and  there is a more explicit recognition that key risks can result not only from increased warming, but also from changes in the exposure and vulnerability of society, and from a lack of ambitious adaptation efforts. Thus, relatively limited warming does not automatically imply that key risks will not occur. In assessing key risks, we have applied four criteria: magnitude of adverse consequences, likelihood of adverse consequences, temporal characteristics of the risk, and ability to respond. Of course, this is an aggregated approach to what is dangerous; it should be noted that in practice, 'dangerous' will occur at a myriad of temperature levels depending on who or what is at risk , geographic scale and time scale.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report