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It is unfortunate that the greens have decided to fall on their swords over Keystone. There are real environmental issues that ought to be in their sights. Keystone may well become the greens’ Waterloo.

Robert A. Manning is a senior fellow of the Brent Scowcroft Center for International Security at the Atlantic Council and of its Strategic Foresight Initiative. He served as a senior counselor to the undersecretary of state for global affairs from 2001 to 2004.