Europe is facing increasingly severe heatwaves, raising fresh questions among scientists about how far human adaptation can go in a rapidly warming climate. Late June brought record temperatures across France, Spain, the United Kingdom, Belgium, the Netherlands, Switzerland, and Germany, with Germany’s national weather service reporting an unprecedented stretch of intense early-summer heat.

WHO warns Europe must 'plan for heat like winter flu' as experts reveal how permanent this summer's extreme heat is.

Temperatures are set to soar in the US around the July 4 holiday, a week after Europe struck new records. With experts predicting more intense and more frequent heat waves in the…