NRDC claims win on bitumen debate Calgary, Alberta (UPI) Dec 9, 2015 - The Natural Resources Defense Council said it was vindicated by peer-reviewed studies showing heavier grades of crude oil should be treated with caution. A 180-page study from the National Academies of Sciences, Engineering, and Medicine finds diluted bitumen, a heavier grade of oil found in North America, has similar properties to other forms of oil immediately after a spill. Weatherin ... more

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