I am afraid environmentalists will sue and tie this up in court no matter what Congress does. Most people do not realize that most enviromental laws have citizen lawsuits provisions that the public can use to force the government to enforce law and regulation standards. Also Native Americans say the pipeline will cross their sovereign nation and will sue also. Meanwhile, Canada will likely determine Marvy Superhero Envirohole Obama will fight this because conservatives want it, and build a trans-Canada to an eastern seaport to ship oil out in tankers, likely to China. China will burn the hell out it and pollute the air.