through a dangerous crevice field. >> we're winding our way through the crevices of the llewellyn glacier. everyone's making their way very carefully here because the glacier gets a little broken up, but it's a beautiful day, and it looks like we might make it all the way to lake atlin. >> we struggle down through this dusty and blowing newly uncovered ground where the vast llewellyn has melted and finally we make our way down this long valley to lake atlin. here we're picked up by a boat and start deciphering the data and working it into the scientific literature, where researchers around the world can use it to fine tune their climate change predictions. from the glaciological and arctic sciences institute on lake atlin, british columbia, this is jeffrey barbee reporting for link tv. >> glaciers are not the only things melting. so is arctic sea ice. just how fast is the sea ice melting? research scientist julienne stroeve is working with the national science foundation to find out. >> i know the importance of snow and ice in helping regulate the planet's temperature, it's one of the rea