Mitigation pathways exploring end-of-century temperature targets often entail temperature overshoot, that is the extent to which temperature is allowed to temporarily exceed a given target.
Mitigation pathways exploring end-of-century temperature targets often entail temperature overshoot, that is the extent to which temperature is allowed to temporarily exceed a given target. Little is known about the additional climate risks generated by overshooting temperature, its extent being a function of many variables defining how rapidly human systems can be transformed, including socioeconomic and technological progress variables.
A study led by RFF-CMCC European Institute on Economics and the Environment (EIEE) and just published in Nature Climate Change assessed the benefits of limiting overshoot. Researchers computed the probabilistic impacts for different warming targets and overshoot levels on the basis of an ensemble of integrated assessment models. They explored the physical and macroeconomic impacts associated with mitigation pathways with different levels of temperature overshoot.
“Our study”, says Laurent Drouet, senior scientist at EIEE and Lead Author of the study, “demonstrates clearly that temperature overshooting affects the likelihood of many critical physical impacts, such as those associated with heat extremes. We also showed how, after mid-century, overshoot leads to both higher mitigation costs and economic losses from the additional impacts. The study highlights the need to include climate risk analysis in low-carbon pathways.”
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