As the world heats up, will climate action, too?

The Northern Hemisphere is hot this week. Very hot. 

In London, temperatures climbed above 104 degrees Fahrenheit for the first time in recorded history. It was enough to melt the runway at a British air force base.

In southwestern France, wildfires fueled by the hot, dry weather burned through pine forests and forced the evacuation of some 14,000 residents. In Portugal, temperatures reached 117 F, and the Portuguese health ministry reported that this heat was responsible for some 700 deaths. Hundreds of people died in Spain’s heat wave, as well,...