Mount Everest’s Khumbu Glacierwhich lies at an altitude of 5,486 metres (17,999 ft) on the Nepali slopes of Mount Everest is the highest glacier in the world, a monumentally slow-moving river of ice that stretches thousands of feet along the mountain’s western face. But as Earth continues to warm, the Khumbu is melting faster than ever, forming lakes as long as several football fields