The three recent Special Reports of the IPCC provide an opportunity to understand overarching climate risk, as they cover a wide diversity of risks to natural and human systems. Here we develop a scoring system to translate qualitative IPCC risk assessments into risk scores that, when aggregated, describe global risk from climate change. By the end of this century, global climate risk will increase substantially with greenhouse gas emissions compared to today (composite risk score increase of two- and fourfold under RCP2.6 and RCP8.5, respectively). Comparison of risk levels under +1.5 °C and +2 °C suggests that every additional 0.5 °C of global warming will contribute to higher risk globally (by about a third). Societal adaptation has the potential to decrease global climate risk substantially (by about half) under all RCPs, but cannot fully prevent residual risks from increasing (by one-third under RCP2.6 and doubling under RCP8.5, compared to today).

IPCC 最近的三份特别报告提供了一个了解总体气候风险的机会，因为它们涵盖了对自然和人类系统的广泛风险。在这里，我们开发了一个评分系统，将定性 IPCC 风险评估转化为风险评分，这些评分汇总后可描述气候变化带来的全球风险。到本世纪末，与今天相比，全球气候风险将随着温室气体排放而大幅增加（在 RCP2.6 和 RCP8.5 下，综合风险评分分别增加了两倍和四倍）。+1.5°C 和 +2°C 下的风险水平比较表明，全球变暖每增加 0.5°C，全球风险就会增加（约三分之一）。在所有 RCP 下，社会适应有可能大幅降低全球气候风险（约一半），