He doesn't go on and on about the woods and the rivers -- he goes on and on about working class Vermonters who can't afford health care and heating oil. His issue is inequality and unfairness, and it has been from the start. And for those of us who do work mostly on the environment, that's just the kind of ally we need.
Alberta tar sands oil and North Dakota light shale oil flows into the same markets, have access to the same refineries, and rely on the same pipelines and railroads to get them to the same customers. So it was never terribly plausible that Keystone would be good for the U.S. -- it was designed to make Canadian oil more competitive in global markets.