Abstract
As climate change unfolds, weather systems in the United States have been shifting in patterns that vary across regions and seasons1,2,3,4,5,6,7. Climate science research typically assesses these changes by examining individual weather indicators, such as temperature or precipitation, in isolation, and averaging their values across the spatial surface. As a result, little is known about population exposure to changes in weather and how people experience and evaluate these changes considered together. Here we show that in the United States from 1974 to 2013, the weather conditions experienced by the vast majority of the population improved. Using previous research on how weather affects local population growth8,9,10,11,12,13,14 to develop an index of people’s weather preferences, we find that 80% of Americans live in counties that are experiencing more pleasant weather than they did four decades ago. Virtually all Americans are now experiencing the much milder winters that they typically prefer, and these mild winters have not been offset by markedly more uncomfortable summers or other negative changes. Climate change models predict that this trend is temporary, however, because US summers will eventually warm more than winters. Under a scenario in which greenhouse gas emissions proceed at an unabated rate (Representative Concentration Pathway 8.5), we estimate that 88% of the US public will experience weather at the end of the century that is less preferable than weather in the recent past. Our results have implications for the public’s understanding of the climate change problem, which is shaped in part by experiences with local weather15,16,17,18,19,20. Whereas weather patterns in recent decades have served as a poor source of motivation for Americans to demand a policy response to climate change, public concern may rise once people’s everyday experiences of climate change effects start to become less pleasant.
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Acknowledgements
We thank J. Alder, S. Anderson, A. Barreca, N. Beck, C. Dawes, S. Gordon, M. Hetherington, S. McDermid, J. Rappaport, M. Siegal and M. Smith.
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P.J.E. and M.M. conceived the study. M.M. compiled the geographical data and weather data. P.J.E. performed the modelling. P.J.E. and M.M. analysed the results and wrote the paper.
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The authors declare no competing financial interests.
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The data and code needed to reproduce results have been deposited at P.J.E.’s Harvard University Dataverse website (https://dataverse.harvard.edu/dataverse/patrickegan).
Extended data figures and tables
Extended Data Figure 1 Stations and counties in weather data set.
Green markers indicate GSOD weather stations (temperature and humidity data; n = 324). Purple markers indicate USHCN weather stations (precipitation data; n = 601). Shaded counties are those with valid weather data (n = 3,037). Only counties with population centroids within 160 km of at least one GSOD station and one USHCN station, both reporting valid data, were included in the analysis.
Extended Data Figure 2 Change in WPI and GSOD weather stations per county.
Map shows population growth rate equivalent change in WPI by decade (same as Fig. 2b). Size of dots represents the number of GSOD weather stations assigned to each county.
Extended Data Figure 3 Voronoi analysis.
Map shows locations of GSOD weather stations (n = 233) and associated polygons used in Voronoi analysis (Extended Data Table 5).
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Egan, P., Mullin, M. Recent improvement and projected worsening of weather in the United States. Nature 532, 357–360 (2016). https://doi.org/10.1038/nature17441
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DOI: https://doi.org/10.1038/nature17441
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