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Politics : Foreign Affairs Discussion Group

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To: Nadine Carroll who wrote (190650)	7/2/2006 1:29:13 AM
From: Wharf Rat	Read Replies (1) of 281500

"There are a lot of 'ifs' in there and I don't see that there is anything like like a consensus on anything beyond the existence of the greenhouse effect." That's because you don't want to. That's ok; anything else would be too scary, eh? I can understand that. So you probably don't want to think about starting here... ======== How do we know that recent CO2 increases are due to human activities? Filed under: Climate Science Paleoclimate Greenhouse gases FAQ— eric @ 4:09 pm - () Note:This is an update to an earlier post, which many found to be too technical. The original, and a series of comments on it, can be found here. See also a more recent post here for an even less technical discussion. Over the last 150 years, carbon dioxide (CO2) concentrations have risen from 280 to nearly 380 parts per million (ppm). The fact that this is due virtually entirely to human activities is so well established that one rarely sees it questioned. Yet it is quite reasonable to ask how we know this. realclimate.org

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