An ‘all of the above’ strategy for transportation

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Efforts to incorporate ethanol, biodiesel, hydrogen and natural gas have hit problems – corn-based ethanol has driven up food prices, for example – and penetration remains low.

The lower power density of these alternatives, coupled with an underdeveloped network of fueling stations, has stymied their use. They have done little to reduce carbon emissions. Clean diesel, a highly efficient technology, isn’t an oxymoron, but the Volkswagen scandal soured those prospects.

So something else is required to shrink transportation’s carbon footprint.

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