http://www.w3.org/ns/prov#value | - THE CANADIAN PRESS/APWASHINGTON - The Keystone XL pipeline issue has created a tiff between a former U.S. president and the Canadian government.The Prime Minister's Office reacted swiftly Wednesday to a letter signed by Nobel laureates, including Jimmy Carter, urging President Barack Obama to reject the pipeline.Carter is the first former president to come out against Keystone XL.Prime Minister St
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