Your analysis is too limited in scope. The US and Canadian Coast Guard both have  major concerns about the increase in tankers coming out of Canada, which you've not included in your review. Kinder Morgan anticipates doubling the capacity of its Trans-Mountain Pipeline. Even with the use of larger capacity tankers, this increases tanker traffic, from BC, substantially. While US efforts to safely transport oil out of our region have been very effective, the major concern is that Canada, while planning to have an additional six stations for oil spill response, is not ready for the proposed increase in tanker traffic from Canadian ports. Oil industry maps and modeling show that oil spills in Canadian waters will not respect national boundaries.

The other issues under study are the toxicity of diluted bitumen — a heavy oil that is more difficult to contain and clean up than crude or refined oil and the ability to clean up any oil product when ocean conditions are not favorable.