EcoWatch: The Vietnam War might seem irrelevant to the environmental movements five-year effort to stop construction of the Keystone XL pipeline that, if approved by President Obama, would bring tar sands oil from Alberta to the Texas coast for refining and shipment overseas. But the more I look at the situation, the more I see worrisome similarities. Both American war planners and environmental movement leaders made the same strategic mistake: conceptualizing transportation as a single fixed conduit that...