The Athabasca Glacier is one of the six principal 'toes' of the Columbia Icefield, located in the Canadian Rockies. The glacier currently recedes at a rate of 2–3 metres (6.6–9.8 ft) per year and has receded more than 1.5 km (0.93 mi) in the past 125 years and lost over half of its volume. The glacier moves down from the icefield at a rate of several centimetres per...