The U.K.'s record-breaking heat wave threatens to become the new normal

The United Kingdom is generally known for its relatively moderate temperatures, including cool summers and winters that are generally mild. This week, though, the British Isles are undergoing the most intense heat wave on record, with temperatures at Heathrow Airport hitting 104 degrees Fahrenheit on Tuesday.

There is no other way to explain this development than human-made climate change bringing the heat to what were once temperate areas of the planet. There will soon be few countries left untouched, no region of the Earth that can’t expect punishing heat during its summer...