Guardian: The Greenland ice sheet is riddled with channels that could quicken ice loss and speed sea level rise, a new study has revealed. Unique video footage taken hundreds of metres inside the ice has revealed a complex subglacial network of interconnecting tunnels that carry water from the surface to deep inside the ice sheet. Konrad Steffen, an ice expert at the University of Colorado, told a global warming conference in Copenhagen that the discovery could explain sudden and severe …