"That's the challenge of our energy supply picture at the present time, " Beard says.

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Church, who maintains a thick mountain-man beard, says that advances in data and in medicine make it impossible to guarantee anonymity for most medical experiment volunteers.

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So far, just 12, 000 buildings out of the 5 million in the U.S. have earned an Energy Star rating, says Maura Beard, a communications director at the EPA for Energy Star.

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"Movember is the perfect excuse for men to trial facial hair, especially those who worry about not being able to grow a full beard or mustache, " she says.

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Everyone's beard grows differently, which Mr. Ttoffali says likens it to a fingerprint.

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"The U.S. has the best chance to win the most medals by far, " says Olsen, who sports a Garibaldi-style beard and helped organize the 2003 Carson City and 2009 Anchorage world championships.

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"Unlike Greenspan, Bernanke has a beard, so you can't see his whole face, " says Erin Crowe , who has painted more than 50 larger-than-life images of the Fed chairman, several of which can be currently seen at her "Goodbye Greenspan" exhibit at the Broome Street Gallery in downtown Manhattan.

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