Canadian Press: One of the great ironies of the interminable saga of Keystone XL is that two of its principal antagonists were unaware that they went to grade school together. In the midst of one of the biggest environmental fights in American politics, the best-known activist on one side learned of his distant connection to the most powerful politician on the other: Stephen Harper. So these old grade-school alumni duked it out from a distance as the pipeline escalated from a regional land dispute to international...