Over a decade ago, California Gov. Arnold Schwarzenegger announced plans for a “hydrogen highway.” He dreamed of converting the day’s most popular vehicles — SUVs and Hummers — into zero-emission cars powered by hydrogen. But he proved to be ahead of his time, and the idea quickly languished.

But thanks to new technologies and renewed interest from the public and private sectors, the hydrogen economy is in the headlines once again. And this time it may be for real.

UPS will put a hydrogen fuel cell truck through the rigors of its demanding delivery schedule.

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