1 billion barrels is a mere .05% of the 2 trillion barrels that the article suggests.
Right. My "billion barrels" is from talking to an oil geologist here who is familiar with their discovery (as well as being one of the few geologists predicting oil finds in the Great Basin for at least 10 years) and how much more exploration they need to do to nail down the really big numbers. A billion is explained to me as "safe" based on the information/science there now, and greater estimates will take more exploration and a lot more money.