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This study is misleading at best, and false at worst. As has become distressingly common, it substitutes "greener" for "produces the least CO2."
For the record, there is far, far more to being "green" than "minimizing CO2." Indeed, sometimes "green objectives" contradict: what might produce more CO, soot, etc produces less CO2 (thinking here about CNG vs diesel in city buses). Which is "greener" is open to debate.
(After all, if CO2 "isn't everything...it's the only thing," I could be "green" by heating my house with my used tires and used motor oil...saves on nat. gas, and avoids burning fuel to get to the recycling drop-off point. The huge plumes of toxic smoke would apparently be beside the point.)
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