Associated Press: The much-debated Keystone XL pipeline could produce four times more global warming pollution than the State Department calculated earlier this year, a new study concludes.
The US estimates didnt take into account that the added oil from the pipeline would drop prices by about $3 a barrel, spurring consumption that would create more pollution, the researchers said.
The researchers estimate that the proposed pipeline, which would carry oil from tar sands in western Canada to refineries on the...