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Title: Communicating the deadly consequences of global warming for human heat stress
Authors: Matthews, Tom K.R.
Wilby, Robert L.
Murphy, Conor
Keywords: Climate change
Heat stress
Extreme heat
Issue Date: 2017
Publisher: PNAS © The Authors
Citation: MATTHEWS, T.K.R., WILBY, R.L. and MURPHY, C., 2017. Communicating the deadly consequences of global warming for human heat stress. Proceedings of the National Academy of Sciences of the United States of America, 114 (15), pp. 3861-3866.
Abstract: In December of 2015, the international community pledged to limit global warming to below 2 °C above preindustrial (PI) to prevent dangerous climate change. However, to what extent, and for whom, is danger avoided if this ambitious target is realized? We address these questions by scrutinizing heat stress, because the frequency of extremely hot weather is expected to continue to rise in the approach to the 2 °C limit. We use analogs and the extreme South Asian heat of 2015 as a focusing event to help interpret the increasing frequency of deadly heat under specified amounts of global warming. Using a large ensemble of climate models, our results confirm that global mean air temperature is nonlinearly related to heat stress, meaning that the same future warming as realized to date could trigger larger increases in societal impacts than historically experienced. This nonlinearity is higher for heat stress metrics that integrate the effect of rising humidity. We show that, even in a climate held to 2 °C above PI, Karachi (Pakistan) and Kolkata (India) could expect conditions equivalent to their deadly 2015 heatwaves every year. With only 1.5 °C of global warming, twice as many megacities (such as Lagos, Nigeria, and Shanghai, China) could become heat stressed, exposing more than 350 million more people to deadly heat by 2050 under a midrange population growth scenario. The results underscore that, even if the Paris targets are realized, there could still be a significant adaptation imperative for vulnerable urban populations.
Description: This paper was accepted for publication in the journal Proceedings of the National Academy of Sciences of the United States of America and the definitive published version is available at http://dx.doi.org/10.1073/pnas.1617526114.
Version: Accepted for publication
DOI: 10.1073/pnas.1617526114
URI: https://dspace.lboro.ac.uk/2134/24742
Publisher Link: http://dx.doi.org/10.1073/pnas.1617526114
Appears in Collections:Published Articles (Geography and Environment)

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