"It's very disturbing," study co-author Matthew Huber of Purdue University in the U.S. state of Indiana told Reuters. It found that around 750 million people could experience one week per year of potentially deadly humid heat if temperatures rise 2 degrees Celsius (3.6 degrees Fahrenheit) above preindustrial levels. At 4C of warming, Hodeidah, Yemen, would see around 300 days per year of potentially unsurvivable humid heat. WET-BULB THRESHOLDTo track such moist heat, scientists use a measurement known as "wet-bulb" temperature. Beyond this, people were likely to succumb to heat stress if they could not find a way to cool down.

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Persons: Nico, Adrees Latif, Matthew Huber, Huber, George Mason, George Mason University climatologist Daniel Vecellio, Vecellio, Jane Baldwin of, Gloria Dickie, Andrew Heavens Organizations: Emergency Aid Coalition, REUTERS, U.S . Midwest, Purdue University, Reuters, George, George Mason University, National Academy of Sciences, Jane Baldwin of University of California Irvine, Thomson Locations: Houston , Texas, U.S, Delhi, Shanghai, U.S ., Indiana, India, Pakistan, Lagos, Nigeria, Chicago , Illinois, South America, Australia, Hodeidah, Yemen, London