Bloomberg: Carbon-dioxide emissions caused by the Keystone XL pipeline could be more than four times higher than a draft U.S. analysis found, according to a Natural Resources Defense Council report released today. The NRDC, a New York-based environmental group that opposes the $5.3 billion project to link Albertas oil sands to refineries in the U.S. Gulf Coast, says Keystone would add as much as 1.2 billion metric tons of carbon pollution to the atmosphere over 50 years. Thats a much higher rate than estimated...