With the advent of shale gas extraction, oil isn't running out anytime in the next 3 generations at minimum; however I do agree that there likely is a need to move away from our carbon emission laden energy methods well before then. Sadly these same people who champion shutting down North American pipelines are the same ones that PR nuke any nuclear energy initiatives, guaranteeing our dependence on oil. Solar and wind, while excellent supplements to oil, simply cannot have the energy density to replace oil, without even getting into the logistics of using power that cannot be efficiently stored. Our only chance to move on from oil with science as it is is with nuclear power, which sadly also gets shut down by the same uneducated and emotional group going after oil. Shutting down this pipeline will have no positive impacts on the environment, as I said it would've been a much safer alternative to the methods that will be used instead. It will also not in any way impact global oil usage, as Iran, Saudi Arabia, and other countries will be more than happy to pick up the slack while emitting 20x the CO2 during extraction than Canadian or even American oil would.

I'd like to reiterate I agree we need to move on from oil, but this will not accomplish that, nor will it improve the environmental situation. What it will do is ruin many livelihoods and result in a net increase in global CO2 emissions.