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Five billion people will face extreme heat at least a month each year by 2050

Experts consulted on the strengths and limitations of the WBGT metric and the physiological impacts of different levels of heat include Zac Schlader (Indiana University at Bloomington), W. Larry Kenney and Daniel Vecellio (Pennsylvania State University), Jonathan Patz (University of Wisconsin at Madison), George Havenith (Loughborough University, U.K.) and Jason Lee (National University of Singapore).