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FIGURE 6.21 Projected changes in number of very hot days in the United States for lower- and higher-emissions scenario. The number of very hot days will increase substantially across virtually the entire country, in some places doubling or even trebling the number of days above 90°F. SOURCE: USGCRP (2009a).

FIGURE 6.21 Projected changes in number of very hot days in the United States for lower- and higher-emissions scenario. The number of very hot days will increase substantially across virtually the entire country, in some places doubling or even trebling the number of days above 90°F. SOURCE: USGCRP (2009a).

that warmer air can hold more moisture, is that the fraction of rainfall falling in the form of heavy precipitation events will increase in many regions (Meehl et al., 2007a). These and other projected changes in precipitation, and the impact of these changes on freshwater resources, are explored in Chapter 8. Later chapters also explore how changes in temperature, precipitation, and other aspects of the physical climate system are likely to affect ecosystems (see Chapter 9), agriculture (Chapter 10), human health (Chapter 11), the urban environment (Chapter 12), transportation (Chapter 13) and energy systems (Chapter 14), and national security (Chapter 16).



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