A heat dome in the Western part of the continent reached 117 degrees. A town in British Columbia burned to the ground, and temperatures in Europe are shattering records. Climate change is here and it’s killing us. But it’s not just the heat. It’s the humidity. That’s why scientists are studying “wet bulb conditions”— or temperatures at which humans spontaneously die.

What, exactly, are “wet bulb” conditions and when do we need to start worrying about them? Can we do anything to stop them? Are people already dying? Here to answer these questions and more is Motherboard intern Audrey Carleton, who has been covering this for the site.

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