Keys to Glory
I don't see the Keystone pipeline fight as an important one in the global warming battle. Whether it is built or not is highly unlikely to affect the development of Canadian tar sands. This is a largely symbolic fight, highly unlikely to do much to slow carbon emission and certain to energize opponents.
If you want to slow carbon emissions, carbon taxes are the way to go. They won't be popular, but people aren't buying the gimmicks either.