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Heatwaves loom as a growing threat to humanity in a warming climate. This summer alone, in the northern hemisphere, thousands have died during extreme heat events. It's driving researchers to find out more about the point when heat turns deadly.
As I understood it, the dashed line is just the 35°C wet bulb temperature line.
I think it’s the “old assumed border of survivability” and don’t know if it is based solely on mathematics or on other experiments as well.
I also don’t know on how many individuals the new line is based and what age group the older people one is.