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Politics : The Environmentalist Thread

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To: Thomas A Watson who wrote (10332)	3/11/2007 11:50:11 PM
From: Wharf Rat	Read Replies (1) of 36917

Fact: Water vapor is by far the largest greenhouse factor. Yes, indeed. It's called a feedback gas. Temperature dependent. Water vapour: feedback or forcing? Filed under: Climate Science Greenhouse gases Climate modelling FAQ— gavin @ 7:51 pm Whenever three or more contrarians are gathered together, one will inevitably claim that water vapour is being unjustly neglected by 'IPCC' scientists. "Why isn't water vapour acknowledged as a greenhouse gas?", "Why does anyone even care about the other greenhouse gases since water vapour is 98% of the effect?", "Why isn't water vapour included in climate models?", "Why isn't included on the forcings bar charts?" etc. Any mainstream scientist present will trot out the standard response that water vapour is indeed an important greenhouse gas, it is included in all climate models, but it is a feedback and not a forcing. From personal experience, I am aware that these distinctions are not clear to many, and so here is a more in-depth response (see also this other attempt). realclimate.org

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