ReutersWTI flips into big backwardation after pipeline spill: KempReutersLONDON (Reuters) - U.S. crude futures prices have swung into substantial backwardation after a spillage on the Keystone pipeline severely reduced crude deliveries from Canada into the U.S. Midwest. An aerial view shows the darkened ground of an oil ...Awakening Global Consciousness With Cleantech ActivismCleanTechnicaTransCanada: Over 24K Gallons of Oil Recovered From SpillU.S.