IN ITS heyday, the Pastoruri glacier in central Peru, drew daily throngs of tourists packed into dozens of double-decker buses 16,000ft (5,000m) high into the Andes to ski, build snowmen, and scale its dizzying peaks.

Peru’s White Mountain Range may soon have to change its name because rising temperatures are fast melting the ice atop Cordillera Blanca, the largest glacier chain in the tropics, and peaks are turning brown.