Italy glacier tragedy has 'everything to do' with climate change

In the early hours of Sunday afternoon (3 July), a huge chunk of the Marmolada glacier in the Dolomites (northeastern Italy) broke off with a tremendous roar.

The collapse of what is technically called a serac triggered an avalanche of rocks and ice that fell at 300 kilometers per hour, sweeping away several hikers. Some were marching toward the summit, some were descending.

An Italian witness, who narrowly escaped the avalanche, called it "a sea of ice". Running would have been...