USGS capturing glacial decline in Glacier National Park through repeat photography

Glacier National Park Decline

From USGS  --  Climate change research in Glacier National Park, Montana entails many methods of documenting the landscape change, including the decline of the parks namesake glaciers. While less quantitative than other high-tech methods of recording glacial mass, depth, and rate of retreat, repeat photography has become a valuable tool for communicating effects of global warming.