In-state oil fields don't all met standard

Environmentalists often call oil from Canada's tar sands the dirtiest fuel on Earth, because the complex process of extracting it spews huge amounts of carbon dioxide into the air.

But by that standard, some of the crude oil pumped in California is just as dirty. In a few cases, it's even worse.

Several California oil fields produce just as much carbon dioxide per barrel of oil as the tar sands do, state data show. A handful of fields yield even more.

Read more: http://www.sfgate.com/business/article/In-state-oil-fields-don-t-all-meet-standard-4267131.php#ixzz2Kz78CKjM

Article courtesy of the San Francisco Chronicle by David R. Baker