Giving 110 Per Cent: The Diminishing Returns of Increased Greenhouse Gas Emissions

[mockingspike]

CO2 is more evenly distributed than water, so if CO2 caused warming it would have a proportionately greater effect in areas where there is little water vapor (such as deserts and in very cold regions), while in areas with a lot of water, the effect of CO2 may be insignificant compared to the effect of water vapor. This is one of many factors that

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Source

[anonymous]

Here's where I got the graph and text from:

http://brneurosci.org/co2.html

Some of the other information from the same page isn't the best information or explanation available, compared to other sources I've seen, but what you see here is pretty good (except that some of the peaks and troughs are slightly offset with respect to where they should be when you try to add them up).

One thing not mentioned in the paragraphs I've quoted here is that the heating attributed to absorbtion of radiation by "greenhouse gases" can still be offset in other ways.