The Greenland ice-sheet is massive. So massive that if it were to melt completely global sea-levels would rise by more than 6 meters. So it's critical that scientists understand how the ice-sheet is changing because of climate change.

Liam Colgan is a glaciologist and professor at York University who specifically studies the Greenland ice-sheet and we got a hold of him by satellite phone as he was in Greenland on a 36 day research expedition led by NASA. We learn about how the Greenland ice-sheet is changing due to climate change, why it matters, and what it's like to do research in such an extreme environment.