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For Scientific American Science quickly, I'm Rachel Felton.

Five years ago. For Scientific American Science quickly, I'm Rachel Feldman. 5.5 trillion tons.

That's how much ice has melted out of the Greenland ice sheet since just 2002.

It's a number almost too large to wrap your head around.

But if you took that much water and used it to fill Olympic-sized pools, which holds 600,000

gallons, by the way, you'd have a lap pool for every person living in Africa and Europe,

all 2.2 billion of them.

The reason we know this is that for more than 20 years, satellites have been watching and

measuring the so-called mass loss from Greenland's ice sheet, one of only two ice sheets in the

world. Antarctica is the other one. What science doesn't know is how the Greenland ice sheet

might come apart. And that's a really important question to answer, because it has a total of 24 feet of sea level rise still locked up in its icy mass.

Today on the show, we're talking to one of our own, Jeff Delvisio, the head of multimedia at Siam and executive producer of the podcast.

Last year, Jeff ventured out onto the ice sheet for a month.

He went with members of a scientific expedition whose sole goal was to drill through the ice to get to the rock below. And he's going to tell us why that matters when it comes to Greenland and the future of the ice sheet.

Thanks for coming on to the show, Jeff. Sure, Rachel. Thanks for having me. So why did you go to Greenland?

...