Three-quarters of the planet could face deadly heatwaves by 2100

It killed 739 people in Chicago 1995. In Europe in 2003, it claimed another 70,000 lives. Just seven years later, it would take down 55,000 more in Russia. Extreme heat can and does kill. And while those heatwaves garnered global attention, according to a study released today in the journal Nature, they're more common than we think. The study's authors note that worldwide, some 30 percent of people are exposed to life-threatening extreme heat for at least 20 days of each year. If we do nothing t