. >> clint mofelt monitors the rivers for the u.s. geological survey. for solutions. >> this area's actually warming at two to three times the global average. the worst cares scenario would be that the rivers, dry up, warm up too much to the point where trout can't inhabit these waters anymore. nothing like sampling trout in montana. >> mosel and his teamwork the glacier nationality park. >> this is climate poster child of north america. as temperature starts warming, we actually see fish moving up the mountain sides. >> that means the trowt trout me to cooler waters. >> this should be a good day. we go into small streams and we use a back tack electrofisher. there's one right there, cutthroat. chaka kahn we're on. >> what are we doing? >> fishing some native cutthroat trout. >> what's the problem here? >> warming temperatures are actually causing the fish to come off sooner. >> these fish like it cold. >> they like it cold. sooner or later, there's going to be nowhere else to go. yep, there's one, little cutthroat. >> how important is the fish in these