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I actually had the opportunity to work as an intern to one of the scientists at NASA's LaRC facility who works on developing the computer models for things like intercontinental pollution transport, aerosol-gas interaction, etc. Now, even though I was just essentially a code monkey for optimizing calculations, what I discovered is that there isn't a whole lot of data out there specifically for pollution, aerosols, and greenhouse gases. Actual in-situ validation flights are really expensive, NASA will maybe pay for one a a year (or every couple of years). Most of the models show slight statistical correlation to human activity and the overall earth temperature, but it's the kind of thing where you might only be 30% sure that human influence is the driving factor. It's the kind of thing worth researching, and monitoring, but isn't some sure-fire crisis of impending doom. Of course, one of the reasons you're going to hear many scientists talk about how certain GW is, is because their whole life revolves around this research. For the people who think they've got something figured out, they're going to defend it tooth and nail (after all, who would want to admit that they've been wrong for years?).
By I'm A Lasagna Hog

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