Yale Environment 360: Roughly one-quarter of the global glacier mass loss between the years 1851 and 2010 can be attributed to human activities, and that fraction increased to more than two-thirds between 1991 and 2010, according to research published in the journal Science. The study is the first to document the extent of human contribution to glacier mass loss, which is driven by both naturally caused climate factors, such as fluctuations in solar radiation, and anthropogenic influences. In the 19th and first half...