Home World News ‘Breaking’ the heat index: US heat waves to skyrocket as globe warms,...NewsWorld News‘Breaking’ the heat index: US heat waves to skyrocket as globe warms, study suggestsJuly 16, 2019113FacebookTwitterPinterestWhatsApp As the globe warms in the years ahead, days with extreme heat are forecast to skyrocket across hundreds of U.S. cities, a study suggests.Source: Yahoo.com