The trouble is that, today, you have these conditions that can sound hot, but we don't really know what it's going to do to people.
By simulating those conditions and exposing people to them, under careful medical supervision, we can better understand the physiology of how people will respond.
Around 70% of the global workforce - 2.4 billion people - are now at high risk of extreme heat, it said.
Despite this, public advice on how to cope with high temperatures is poor, and ways that people can effectively cool themselves have not been well studied.
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