Green but costly, hybrid buses far from mass production

Fuel-efficient and environmentally-friendly, hybrid buses starred at a public transportation congress in Vienna this week, but they still face a long road before becoming cost-effective on a mass scale.

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<p><a href="http://www.physorg.com/news163782375.html">Green but costly, hybrid buses far from mass production</a></p> <p> Fuel-efficient and environmentally-friendly, hybrid buses starred at a public transportation congress in Vienna this week, but they still face a long road before becoming cost-effective on a mass scale.</p>