Field glaciologist Alun Hubbard has been leading research expeditions on the Greenland ice sheet for decades and has seen “gobsmacking changes.” But the last few years have been particularly unnerving.

The Greenland ice sheet is now so out of balance with the warming climate, it will lose enough ice to raise sea level at least 10 inches – even if greenhouse gas emissions ended today, he writes. His latest study, published Monday, lays out the disturbing risks ahead. Hubbard took time during a break in Uummannaq, Greenland, to describe what he’s seeing across the ice sheet and what it means for the rest of the world.

Also today:

Stacy Morford

Environment + Climate Editor

A turbulent melt-river pours a million tons of water a day into a moulin, where it flows through the subglacial environment to ultimately reach the ocean. Ted Giffords

What’s going on with the Greenland ice sheet? It’s losing ice faster than forecast and now irreversibly committed to at least 10 inches of sea level rise

Alun Hubbard, University of Tromsø

A field glaciologist explains the changes scientists are now seeing.

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