llewellyn glacier r in canada is melting fastst, exposing more of itits secrets for researchers brooke stamper and mira dutschke to discover, using photogrammetry and ice lens measurements. as the 2013 field season on the icefield comes to a close, we make our way northeast and walk off the llewellyn glacier through a dangerous crevice field. >> we'e're winding our w way thh the crevivices of t the llewelln glacier. everyone's making their way very carefully here because the glacier gets a littlele bron up, , but it's a beautifulul da, and it looks like we might make it all the way to lake atlin. >> we struguggle down through ts 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 startrt deciphering the data and workrking it into the scientitific literature, wheree 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