Global temperatures are rising at a record pace, edging nearer a ceiling set by some 200 nations to limit global warming, and the human body is more sensitive to heat than previously thought, a University of Hawaii at Manoa study found.
"Dying during a heatwave is like a terror movie with 27 bad endings to choose from," Camilo Mora, the study's lead author, said in a statement.
"It is remarkable that humanity overall is taking such a complacency on the threats that ongoing climate change is posing."
Heat kills people in a variety of ways, from the damage of cells to the leakage of intestines and blood clots that can lead to heart, brain, liver and kidney failure, the study said.
Rising heat is underestimated as a threat because it is an invisible, hard-to-document disaster that claims lives largely behind closed doors, experts told the Thomson Reuters Foundation in September.
Rising heat is a severe threat in regions from South Asia to the Gulf, and countries from Russia to the United States.
Over the last 30 years, increasingly broiling summer heat has claimed more American lives than flooding, tornadoes or hurricanes, according to the U.S. National Weather Service.
(Reporting by Heba Kanso @hebakanso, Editing by Kieran Guilbert and Katy Migiro. Please credit Thomson Reuters Foundation, the charitable arm of Thomson Reuters, that covers humanitarian news, women's rights, trafficking, property rights, and climate change. Visit www.trust.org)
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections.