Because Canadian oil sold to China helps prop up OPEC export prices thereby providing the DNC continued campaign contributions.
Obama would rather have our $Dollars go to people that hate us than to our neighbors.
Because Canadian oil sold to China helps prop up OPEC export prices
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More oil sold on the export market either decreases OPEC prices or their quantity of oil sold.
Oil is a commodity. This means the more there is available to the world market(no matter where it goes)potentially decreases the price. Supply goes up, demand stays constant, price goes down(economics 101). The important thing is the Canadians are going to decrease the cost/barrel of getting this oil/commodity delivered to a potential refinery somewhere in the world. IF the Chinese/Indians/Japanese buy the Canadian oil, then the Iranian & Venezuelan heavy crude oil has to be cheaper or they will need to sell it to someone else. The more oil on the world market that is not in control of OPEC is a good thing for all the consuming countries. It is a bad thing for Russia, Iran, Venezuela, and other countries that have high production costs.
Another point, just because this oil gets to the coast of BC at Kitimat does not mean it is ONLY going to Asia.
Much of this product could end up in refineries in WA, OR and California. However, it would potentially compete with oil coming from Alaska.