The total volume of water that has melted from all of world’s polar ice sheets, ice caps and mountain glaciers over the past decade would repeatedly fill Britain’s largest lake, Windemere, more than 13,000 times, according to one of the most comprehensive studies of Earth’s frozen ‘cryosphere’. Using a unique pair of satellites that have monitored the disappearing ice on the globe’s surface, scientists estimated that some 1,000 cubic miles of ice has disappeared between 2003 and 2010 — enough to cover the US in one-and-a-half feet of water.