Trying to curb increasingly serious air pollution in their cities, authorities in France, followed this week by those in Britain, announced they will ban the sale of new gas and diesel-powered cars by 2040. This may speed up sales of hybrid electric vehicles. In the meantime, engineers are working hard to make such cars more attractive. Researchers at the University of California say their mileage could be improved with smarter onboard computers. VOA’s George Putic reports.

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