Photo: Yellowstone Geysers May Stop Erupting, Study Suggests

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Old Faithful—Yellowstone National Park's most famous geyser—erupts in winter in an undated photo.

Research released in July 2008 suggests that the clockwork-regular eruptions at Yellowstone are slowing down—and may even stop—because of global-warming-related dry spells.

Photograph by Norbert Rosing

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