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Politics : Foreign Affairs Discussion Group

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To: c.hinton who wrote (250356)	12/2/2007 5:44:47 PM
From: Nadine Carroll	Read Replies (1) of 281500

Yes, methane is a potent greenhouse gas, but it is in very small supply. Even after you adjust for its potency, its effect is small: Role of Atmospheric Greenhouse Gases (man-made and natural) as a % of Relative Contribution to the "Greenhouse Effect" Based on concentrations (ppb) adjusted for heat retention characteristics Percent of Total Percent of Total --adjusted for water vapor Water vapor ----- 95.000% Carbon Dioxide (CO2) 72.369% 3.618% Methane (CH4) 7.100% 0.360% Nitrous oxide (N2O) 19.000% 0.950% CFC's (and other misc. gases) 1.432% 0.072% Total 100.000% 100.000% mysite.verizon.net note: I don't know much about this source, but the numbers look consistent with what I've seen elsewhere. Nobody disputes that by far the preponderant greenhouse gas is water vapour; it just tends not be discussed very much.

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