Really? We don't need to ship oil to the US? I guess that's why we have such a glut of refining capacity right. Well I guess we don't, because every time someone wants to go and build a refinery here some group of environmentalists throw a hissy fit. They even throw a hissy fit at expanding and updating existing refineries. So that's why it would be shipped to refineries in the US right? But, I guess the US has no pollution controls, no labor safety and lower wages then Canada? Well I guess the last one is mostly true. Wages in the US are lower than Canada now.
So now you know why we'd ship it to the US, but since the US environmentalists keep throwing a hissy fit too. Canada will sell it to whoever wants to buy it. It has nothing to do with "wages, pollution controls, or wages." It has all to do with environmentalists and them throwing a fit.
By the way, have you ever been to a reclaimed area? Like a coal mine, or an exhausted oil sand area. Places where nothing was growing before, and now it's in a pristine state. Yeah, I guess it's pretty dirty...