(CNN) -- U.S. scientists monitoring shrinking glaciers in Washington and Alaska reported this week that a major meltdown is under way.

A 50-year government study found that the world's glaciers are melting at a rapid and alarming rate. The ongoing study is the latest in a series of reports that found glaciers worldwide are melting faster than anyone had predicted they would just a few years ago.

It offers a clear indication of an accelerating climate change and warming earth, according to the authors.

Since 1959, the U.S. Geological Survey, which published the study on its Web site, has been tracking the movements of the South Cascade glacier in Washington and the Wolverine and Gulkana glaciers in Alaska. The three glaciers are considered "benchmarks" for the conditions of thousands of other glaciers because they're in different climate zones and at various elevations.

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