A tour boat is seen near a glaciers terminus in the Kenai Mountains on September 06, 2019 near Primrose, Alaska. Scientists from the U.S. Geological Survey have been studying the glaciers in the area since 1966 and their studies show that the warming climate has resulted in sustained glacial mass loss as melting outpaced the accumulation of new snow and ice. (Photo by Joe Raedle/Getty Images)
