View of Grinnel Glacier, located in Glacier National Park, Montana, in 1900 and 2008, showing significant glacial retreat. In 1900 Grinnell Glacier's mass filled the cirque basin. The early photo (left) shows the glacier's height along the headwall and how it was once joined the upper ice portion, now called The Salamander. With evidence of worldwide glacial recession and modeled predictions that all of the park's glaciers will melt by the year 2030, scientists have begun to document glacial decline through photography.