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The Prius has never been the greenest option. Toyota's own Echo and Yaris, and the small Hondas and Nissans all come very close to the Prius in gas milage. That's before accounting for the extra energy and resources required to build the larger Prius.
Hybrid technology is 75 per cent about marketing, as is fuel cell technology, ethanol, etc.
But that's okay. The Prius is a very nice car, and if Toyota's marketing department has swayed buyers away from other, less environmentally friendly options, that's a good thing.
The only alternative that truly makes sense is the plug-in electric. Nothing else comes close.