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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

Greenland is the biggest island in the world, and the ice sheet that sits atop it is massive.

The pile of ice is so thick that it extends more than 10,000 feet above the ocean.

And if all that ice were to melt and go into the ocean, global sea

levels would rise by 24 feet everywhere around the world. Jason Briner, a geologist at the University

at Buffalo. The ice sheet is melting, of course, but just how much compared to the past.

Bryner's team did a computer simulation of the southwest portion of the

Greenland ice sheet, which he says is a pretty good proxy for ice melt across the entire ice sheet.

The researchers plugged past climate data into that model to hindcast, rather than forecast,

the past activity of the ice sheet, and they then checked the model's predictions of the past

shape and size of the ice by looking at piles of rocks the model's predictions of the past shape and size of the

ice by looking at piles of rocks and boulders and dirt on Greenland today, which outlined the edges

of ancient ice, and the simulation was in good agreement with the actual situation. Using that

reconstruction of the ice sheet over time, the team could then compare the ice sheet's historic losses to those

happening today under human-cause global warming, and they determine that Greenland is on track

to lose more ice this century than during any century in the past 12,000 years, possibly four

times as much ice. The results appear in the journal Nature.

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