by David McClellan -
Aug 13th, 2008 
You've heard about Al Gore's challenge to remodel the U.S. electrical industry in 10 years to eliminate all CO2 emissions. Some commentators say the job is too big, some say it isn't, but everyone, including Al, agrees it's a big, big job.
But exactly how big? What are we up against here? How much new wind, solar, geothermal power do we need to replace the CO2 producing plants? What else might be needed to make such a system work?
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