Tar sands pipeline plan renews energy vs. environment debate

PBS: Transcript JEFFREY BROWN: Next: a friendly and safe new source of oil for the U.S. or an environmental disaster waiting to happen? The tar sands of Alberta, in western Canada, are today considered one of the largest oil reserves in the world, a source of crude petroleum known as bitumen. But the extraction of oil there has come with concerns about the environmental impact. And now those concerns have exploded with a plan by the Calgary-based company TransCanada to build a massive pipeline to......

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