The sands of Canada: Oil supply salvation or sinkhole?

Oregonian: In vast strip mines north of this Alberta boomtown, shovel machines bigger than five-story buildings rip out tar-soaked sand, dumping 400-ton loads in trucks that feed the voracious U.S. appetite for oil. Factories in Canada's "oil sands," site of the world's largest single oil deposit, use super-heated water to purify the rich black glop. Much of the petroleum is piped to U.S. refineries, making Canada -- not Saudi Arabia or Venezuela -- America's top oil supplier. A century and a half into the......

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