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Politics : The Environmentalist Thread
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To: Brumar89 who wrote (34118)6/28/2011 1:58:11 PM
From: Land Shark  Read Replies (2) of 36917
 
>And more water vapor makes more clouds which cool the earth.

This is not entirely true. It depends on where you are in the planet. Some clouds have insulating capacity. I.e. they reflect the IR radiation back to earth. Some clouds are the opposite. Studies have shown that the net effect is nil.

>Water vapor as a percent of the atmosphere has varied widely throughout the earths history (think of all the water once tied up in ice sheets).

Again water vapour is a feed back (more CO2 means more water). It's not as an important GHG as either CO2 or methane (CH4).
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