Greenland ice sheet could fully melt after reaching specific tipping point, study finds
phys.org
Greenland's ice sheet currently spans over 1.7 million square kilometers and is the largest freshwater reservoir in the northern hemisphere. The ice sheet has already lost over a trillion tonnes of its total mass since the 1980s, with melting rates six times higher in the last decade. Indeed, a recent study found that an average of 30 million tonnes of ice is now being lost every hour.

The researchers used modeling to simulate the impact of different climates on the surface mass balance. They found that when approximately 230 gigatons of ice is lost in a single year, corresponding to 60% of the surface mass balance compared to pre-industrial times, then this is the pivotal tipping point that could initiate a relatively rapid descent (geologically speaking, at 8–40,000 years) into complete loss of the Greenland ice sheet.