Measured Retreat

The NASA Earth Observatory has updated its fact sheet on global warming and invites readers to send in questions they may have. The photo (above) of the Athabasca Glacier in Western Canada was taken in 2005. According to the Earth Observatory,

In the past 125 years, the Athabasca Glacier has lost half of its volume and receded more than 1.5 kilometers (0.93 miles), leaving hills of rock in its place. Its retreat is visible in this photo, where the glacier’s front edge looms several meters behind the tombstone-like marker that indicates the edge of the ice in 1992. The Athabasca Glacier is not alone in its retreat: Since 1960, glaciers around the world have lost an estimated 8,000 cubic kilometers (1,900 cubic miles) of ice. That is approximately enough ice to cover a two-kilometer-wide (1.2 mile-wide) swath of land between New York and Los Angeles with an ice sheet that is one kilometer (0.62 miles) tall.