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Threatened vistas: the explosive growth of coal-fired power plants in the Four Corners region could jeopardize the archaeological treasures of Mesa Verde and Chaco Canyon.

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STANDING ATOP A ROCK-STREWN MESA at Chaco Canyon, Barbara West can gaze back in time. To one side lie the Pueblo Alto ruins--remnants of a great house rising from the tawny earth. On the other is a vast expanse, cradling the very roots of Chaco civilization.

"When you get up on top of a mesa by Pueblo Alto and you look out, the skies are pretty clear," says West, the superintendent of Chaco Culture National Historical Park in northwestern New Mexico. "There's not a whole lot of development, just the occasional Navajo dwelling or camp. It's a pretty unoccupied landscape."

But hundreds of years ago, from 850 to 1250 A.D., Chaco was a ...

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