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Politics : Foreign Affairs Discussion Group -- Ignore unavailable to you. Want to Upgrade?

To: Wharf Rat who wrote (187830)	5/31/2006 6:39:55 PM
From: Hawkmoon	Read Replies (1) \| Respond to of 281500

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). Ok.. I'll accept that, since it would appear logical that atmosperic water vapor would only reach a certain level of atmospheric saturation before precipating as rain, sleet, or snow. Question for you though.. H2O vapor is lighter than N2, O2 and C02, right? Air with 100% humidity is less dense than "dry air", right? So if "dry air" has a greater percentage of heavier gas molecules, how can there be a greater quantity of lighter gases like water vapor displacing it? Hawk