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Al Gore's "An Inconvenient Truth" highlights data from the European Project for Ice Coring in Antarctica (Epica), which takes samples from antarctic ice to measure temperature and carbon dioxide levels in the Earth's past. Their previous study, referenced in Gore's global warming slideshow, measured 650,000 years in the past, showing a direct correlation between Earth's temperature and CO2.
Slate has an interesting article about the use of air conditioning in the US:
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