More than 30 billion kilowatt-hours of energy is wasted because many of us simply forget to shut down our computers when we?re not using them. If we could just improve the efficiency of how we use our PCs, the savings in energy costs would be over $3 billion! The CO2 emissions from just 15 computers are equivalent in energy terms to the gas consumption used by one car.
http://www.localcooling.com/facts/
and according to this:
http://blog.foreignpolicy.com/node/2281
Microsoft could save 45 million tons of CO2 emissions with a few lines of computer code
Is there a big difference between this local cooling software and the defacto power down screensaver that comes with windows?
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