Nearly half a million people die every year as a result of extreme heat. That’s more than the total from hurricanes, earthquakes and floods combined. And as the planet warms the risk of deadly heat is only increasing.

On today’s Big Take podcast, Bloomberg’s Zahra Hirji brings Sarah Holder a dispatch from a lab at the forefront of understanding how heat affects the human body. They break down the latest science on deadly heat, why everyone is at more risk than they realize — and what actually works to mitigate those risks.

Read more: Scientist Shuts Himself in 104F Chamber in Quest to Study Heat Stress

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