U.N. Secretary-General António Guterres is calling again for a global shift away from fossil fuels in the face of what he called the “extreme heat epidemic.” Guterres’s warning came as a series of high temperature records were broken this week.

Secretary-General António Guterres: “Heat is estimated to kill almost half a million people a year, and that’s about 30 times more than tropical cyclones. We know what it is driving it: fossil fuel-charged, human-induced climate change. And we know it’s going to get worse. Extreme heat is the new abnormal.”

A new U.N. study this week found over 70% of the global workforce is at high risk of extreme heat.