This new epidemic of extreme heat represents one of the gravest threats to humanity, scientists say, but it won’t affect the world in a uniform way. While certain parts of rich countries will see a surge in days, most of the danger will come in poor countries in already hot regions such as South Asia and sub-Saharan Africa that lack widespread air conditioning and other advantages like advanced health-care systems.

arrow-rightcaret-downcaret-left-boldcaret-right-boldcaret-rightemailfacebooklinkedinmag-smallslider-arrow-leftslider-arrow-rightx-twitterxyoutube