What is some of the evidence for speed at which glaciers are melting

The main evidence of glaciers melting is the melting of Alaska's Muir glaciers.

Explanation:

The main reason of melting of glaciers is the increase in temperature due to more emissions of greenhouse gases such as carbondioxide and methane gases. These greenhouse gases trap reflected solar radiation which increases the atmospheric temperature cause global warming. This global warming is responsible for the increase in sea level due to glaciers melting.

not only is it colder, it also becomes darker, less salty, and more dense.