It will be some months before the true toll of Europe's worst-ever heatwave is confirmed, but researchers can estimate a death count based on how many people died in Europe during previous hot periods

This preliminary estimate underscores the growing threat of deadly extreme heat events despite efforts to adapt to a warming world.

It will be some months before the true toll of Europe's worst-ever heatwave is confirmed, but researchers can estimate a death count based on how many people died in Europe during…