Nonetheless, it isn’t potential to say with a high diploma of confidence whether this is because of elevated atmospheric concentrations of greenhouse gases or to other natural or human causes. Continued increases in atmospheric concentrations of greenhouse gases would have an effect on the earth’s radiative balance and will cause a large amount of further greenhouse warming. The panel refers to warming attributable to elevated atmospheric concentrations of greenhouse gases as “greenhouse warming.” Measurements of atmospheric CO2 present that the 1990 concentration of 353 components per million by volume (ppmv) is about one-quarter
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