The petro-dollar is a bit of a catch 22. Either we produce our own domestically and purchase with Canada (ideally using the keystone pipeline - but we know how that played out) or we throw out all of our internal production for "environmental" reasons and continue to pillage the middle east to make sure we have enough oil.

IMO, taking a bit of an environmental hit or trading with Canada is far superior to spending trillions blowing up the middle east and causing more problems than were there to begin with in an already historically unstable region.