anthony arendt. he's from the university of alaska in fairbanks, and he's one of the guys who designed the latest satellite imagery systems for nasa to understand the mass balance of this icefield. >> glaciers respond immediately to any changes in climate. their variations and their mass are determined directly by how much snows falls on them in the wintertime and how much ice and snow melts away due to warmer temperatures in the summertime. so by monitoring glacier variations, we can understand a lot about climate systems, and so they're one of the first sort of early hallmarks of climate change on the planet. >> dr. arendt helps create high-resolution computer models of glaciers like this one using data from satellites, airplanes, and deep snow pits like these to develop a clear picture of our future global climate. 95% of alaskan glaciers are melting at an unnatural and unprecedented pace. >> glaciers are really large contributors to changing sea levels. you want to be able to quantify how much wa