Keep in mind that the unit of measure is ppmv (parts per million by volume). It is clear that CO2 is a very small portion of the atmosphere. Among the so called greenhouse gases, it is a very distant second to H2O. And yet, some people portray CO2 as if it had almost mythical powers of dominating climate around the globe.
While temperatures have gone up and down, the parts per milion by volume increased from 315 to 375 between 1960 and 2003....that's parts per MILLLION!
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