<p>A tar sands mine facility near Fort McMurray, in Alberta, Canada, is shown on Sept. 19. The White House plan to seek alternate routes for a Canada-to-Texas oil pipeline presents a tangle of new problems for the project's backers, and any of those obstacles could still sink the proposal before the first spade of dirt is turned.</p>
November 13, 2011
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November 13, 2011 8:15 p.m.