Energy/Environment Humans now the major cause of alpine glacier melt, researchers say

The researchers estimate that between 1990 and 2010, some 69 percent of the mass lost by the world's alpine glaciers can be traced to human influence – basically global warming.

By , Staff writer

Becky Bohrer/AP/File

Retreating alpine glaciers in a warming world may seem to have an obvious connection. But glaciers respond to environmental changes, well, glacially. At any point, it's hard to tell how much of a glacier's retreat is due to human-triggered factors now and how much is due to natural factors that might have held sway years ago, researchers say.