Yellowstone oil spills fuel arguments over Keystone line

Oil pipeline accidents have become increasingly frequent in the U.S. as Congress pushes for approval of the Keystone XL pipeline - a project that would pass near the spot where 30,000 gallons of crude spilled into Montana's Yellowstone River earlier this month. The recent spill temporarily fouled a city's water supply and became the latest in a string of accidents to highlight ongoing problems with maintenance of the nation's 61,000 miles of crude oil pipelines.

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