The main cause of glacial shrinkage nowadays is [ human activity ]( http://www.theguardian.com/environment/2014/aug/15/humans-now-strongest-driver-of-glaciers-melting-study-finds ) . Way to go, homo sap! This will lead to growing scarcity of fresh water in the areas that get their water from glacial runoff, such as California and northern India.
Ссылка: https://stallman.org/archives/2014-may-aug.html#16_August_2014_%28Glacial_shrinkage%29