Jeremy Martin, Senior Scientist and Fuels Lead for the Clean Vehicles Program, Union of Concerned Scientists

The fuels that power today’s vehicles are cleaner and more uniform than ever, but that’s not the case further “upstream.” Cheap and easily accessed oil reservoirs are drying up, forcing major industry players to extract and refine riskier, costlier and dirtier sources of oil. What we can do to ensure the oil we use doesn’t get dirtier?

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