Hurricane!

If you want to know the relationship between Windows Vista and CO2 emissions, click through.

I found a paper from the UK parliament which makes that about 3% of the average C02 emissions per person here - France emits less Co2 than us - because their electricity is mostly nuclear, so their Co2 saving will be less. US emits twice as much (4.6% of the worlds population contributes 23.8% of green house gasses) so they need all the savings they can find.