Throughout his term as president, Barack Obama has insisted his administration could not allow construction of the Keystone XL pipeline to carry Canadian oil to the U.S. unless the State Department signed off on it.

On Friday, the State Department revealed - at last - that it can find no reason to believe the pipeline would be detrimental to the environment.

Radical environmentalists hate the pipeline proposal - but they have not been able to come up with a reasonable objection to it, either.

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