This article, like so many others concerning glacial retreat, lacks the historical perspective of the last 200 years.  Most glaciers in the Northern Hemisphere have been receding since about 1800.  Of course, photographic evidence is not available from that time but those that study glaciers know of the retreat and where the ice was over that period of time. The scientists could have pointed this out to Mr. Rosen but he either seems to lack the interest or understanding of this perspective, has a dearth of journalist curiosity and/or deliberately misleads.   Case in point, the 2 photos of the Gulkana Glacier in 1967 and 2016 surely demonstrates glacial retreat but with further research Mr. Rosen could have easily drawn a line demarkating on a photograph at where the glacier terminus was say in 1850, or before.  This article is incomplete and misleading at best, propoganda at its worst.... Raise your standards Mr. Rosen.