Extreme heat caused by this year's ‘super-El Niño’ could result in as many as 451,000 excess deaths across the globe in the six months through February 2027, researchers with the University of Chicago's Climate Impact Lab said ↧ 'Super' El Niño could cause 451,000 excess deaths, researchers say Extreme heat caused by this year's "super-El Niño" could result in as many as 451,000 excess deaths across the ​globe in the six months through February 2027, ‌researchers with the University of Chicago's Climate Impact Lab said on Wednesday.