even before you went to svalbard you been covering this for years. out, were you surprised? >> reporter: i wasn't surprised, this is part of a large body of research from scientists who continue to work on this issue from around the world. i could see with my own eyes in svalbard i've seen it and glaciers in alaska. you could see it the rising sea levels on manhattan where they are building a multimillion dollar seawall. you could see it in san diego where there is a train line that's being impacted by waters that start to erode the cliffs. this is a problem in this new research is a continuation of this. >> maurice: it seems like an intense experience to be there in norway. were you affected by what you saw? >> reporter: i really was. i didn't k know what i was walkg into necessarily. let's do something called a mass balance. i wasn't sure what that was. to be there is standing 6 feet tall and have that steak be several feet over my head, i was as you saw quite shocked to understand -- that's what happens in the course of one season. >> john: david