you need to put on the Global Warming Glasses: 
Are you kidding me? I don’t see any major differences between the two photos at all. What I do see are some minor differences in ice and snow coverage and some illusions created by black and white vs color, and by the difference in exposure (such as an area on the slope to the left that appears to be snow or ice in the 1921 photo, but which is actually just a difference in shading of the dirt or rock below it.
As far as the glacier, it actually looks wider today to me than it did in 1921. Am I missing something?
Well the mountains are much more bare.
you need to put on the Global Warming Glasses: