Glacier National Park has lost two more of its namesake moving icefields to climate change, which is shrinking the rivers of ice until they grind to a halt, the U.S. Geological Survey said Wednesday. Warmer temperatures have reduced the number of named glaciers in the northwestern Montana park to 25, said Dan Fagre, an ecologist with the agency.He warned the rest of the glaciers may be gone by the end of the decade. "When we're measuring glacier margins, by the time we go home the glacier is already smaller than what we've measured," Fagre said. The latest two to fall below the 25 acre threshold were Miche Wabun and Shepard. Each had shrunk by roughly 55 percent since the mid-1960s. The largest remaining glacier in the park is Harrison Glacier, at about 465 acres. On a local scale, fewer glaciers means less water in streams for fish and a higher risk for forest fires. More broadly, Fagre said the fate of the glaciers offers a climate barometer, indicating dramatic changes to some ecosystems already under way.

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