I have seen that water vapor even though being the greater player in the green house effects and also having the fastest climatic reaction times never gets brought into any of the positive side of the debates.
When temperatures rise even slightly on the surface more water vapor is produced by evaporation which helps cool things off slightly but still measurably. That warmer moist air tends rise until it reaches a cooler and much higher elevation where it slightly condenses just enough to create clouds which have a substantial solar energy reflecting ability in the infrared heat bands. That ability alone can reduce the effective solar heat energy that reaches the surface and lower atmosphere by half or at times more. That high level reflective ability of cloud cover has the capacity to greatly out weighs the added green house effects of any man made CO2 additions when present.
When the water vapor condenses and creates rain it also absorbs small amounts of CO2 and brings it down to the surface where its then either absorbed directly into the soil where plants can use it or it reacts with the other elements in the ground and is effectively neutralized and locked away as part of the natural CO2 cycle.
These are fairly unbiased links I found that give the basic concepts of how water vapor can have as much positive green house effect as it can a negative one. **broken link removed** and JunkScience.com -- The Real Inconvenient Truth: Greenhouse, global warming and some facts
We may be responsible for 1% of the total negative green house gases effects but water vapor still apparently has far greater self correcting capacity to make up for it. Also it should be noted that every major CO2 producing action we humans use also has a high level of water vapor as the balance of the chemical reactions.
When temperatures rise even slightly on the surface more water vapor is produced by evaporation which helps cool things off slightly but still measurably. That warmer moist air tends rise until it reaches a cooler and much higher elevation where it slightly condenses just enough to create clouds which have a substantial solar energy reflecting ability in the infrared heat bands. That ability alone can reduce the effective solar heat energy that reaches the surface and lower atmosphere by half or at times more. That high level reflective ability of cloud cover has the capacity to greatly out weighs the added green house effects of any man made CO2 additions when present.
When the water vapor condenses and creates rain it also absorbs small amounts of CO2 and brings it down to the surface where its then either absorbed directly into the soil where plants can use it or it reacts with the other elements in the ground and is effectively neutralized and locked away as part of the natural CO2 cycle.
These are fairly unbiased links I found that give the basic concepts of how water vapor can have as much positive green house effect as it can a negative one. **broken link removed** and JunkScience.com -- The Real Inconvenient Truth: Greenhouse, global warming and some facts
We may be responsible for 1% of the total negative green house gases effects but water vapor still apparently has far greater self correcting capacity to make up for it. Also it should be noted that every major CO2 producing action we humans use also has a high level of water vapor as the balance of the chemical reactions.
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