"In most corporate networks, all you have to find is an open port to plug into, " Green said.

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Several green energy companies already pulled the plug on planned IPOs.

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It will be interesting to see how The Green Book does with such future cars as the plug-in hybrid Toyota Prius and the Fisker Karma.

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Finally, fifth gear, the carbon value: plug-in cars will only be as green as the electricity they're using.

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In green car news, Ford's new 2013 C-MAX plug-in hybrid was rated the most fuel-efficient plug-in hybrid available in the US this week.

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But assuming you didn't already put down a deposit on one of these plug-ins, you'll find plenty of other green choices on dealer lots.

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The marquee green car for the show was the Fusion Energi, a production-intent plug-in hybrid with, Ford says, a combined fuel economy of over 100 MPGe (a measure of gasoline-gallon energy equivalence).

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Just plug it in (proprietary cables included), and a few seconds later a green light on the MiC let's you know you're ready to rock.

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Any item with a plug or batteries which fits into an average sized plastic carrier bag can be put in the green box, which is picked up weekly.

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