President Obama's announcement that he'd make the final decision on the Keystone XL pipeline has had a presumably unintended effect. Getting approval on an alternate pipeline path would take at least another year. The Canadians want to sell their oil; if the US path to selling the oil is tied up by politics, then they'll actively seek to sell the oil to Asian markets instead (via a pipeline to Canada's west coast.)
The odd thing is that this consequence is worse than many of the other possibilities. If Obama had kept quiet, the pipeline would presumably gone forwards, with the result of a lot of construction (20,000 jobs, apparently), and improving our energy security. If he'd announced support, we'd have the same result, but he'd be able to claim some credit. If he'd announced that he'd kill the project, he'd gain favor with green constituents, (while of course giving up the economic benefits). But the in-between choice effectively kills the project, while annoying the Canadian government, and signaling governmental paralysis. There had to have been a better way to handle this.