Glacier melt will lead to ice-free peaks in California for first time in human history

New research shows massive glaciers in Sierra Nevada projected to melt away by the beginning of the next century

Deep in California's Sierra Nevada, massive glaciers are disappearing and projected to melt away completely by the beginning of the next century, leaving ice-free peaks for the first time in human history, new research has found.

The mountain range's glaciers are older than previously known, dating back tens of thousands of years, with some as old as the last ice age, according to an article published last week in Science Advances.