The video below, published by National Geographic, shows the research they have been doing in Glacier National Park, documenting the extent of change in the glaciers. The glaciers are melting away at a very rapid pace.
The repeat photo project photo library documents glaciers in Glacier National Park, taking photos from the same spots that historical photos were taken, and repeating over time to see the changes. They are now taking photos at regular intervals, to keep up with the increased pace of the melt. At the same time, they are using other means to document the changes, and measure the glacial melt.
Click on the photos above, and see more of the USGS library, documenting these changes. By 2030, if the current rate of change persists, it is estimated that Glacier National Park in Montana will have no more glaciers.