Houston Business Journal: A new study says the Keystone XL pipeline could produce four times as much global warming pollution as previously believed, the Associated Press reports.
The new estimates, from scientists at the Stockholm Environment Institute, were published over the weekend by the journal Nature Climate Change.
The earlier estimates by U.S. officials did not take into account that added oil from the pipeline would drop prices by about $3 a barrel and spur consumption that would then create more pollution,...