Heavier crudes, heavier footprints

ScienceNews: Relying on heavy oils and tar sands as the feedstock for liquid fuels will exaggerate the greenhouse-gas emissions associated with fossil-fuel use, a new study finds. Light crudes are the easiest to work with. But as their biggest and most accessible reservoirs have been tapped -- and often tapped out -- the oil industry has increasingly been turning to what has been termed “unconventional” stocks. These are viscous, if not tarry, forms of petroleum. And as the upper graph below shows, the average......

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