|NOAA annual greenhouse gas index|
Radiative forcing since 1979 (relative to 1750) due to CO2 alone.
The percent change from January 1/90 is shown on the right axis.
A NOAA managed measurement of the warming caused by long-lived trace gases. The index was designed to provide a normalized standard that can be easily understood and followed.
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From the site: "Increases in the abundance of atmospheric greenhouse gases since the industrial revolution are largely the result of human activity and are largely responsible for the observed increases in global temperature [IPCC 2007].
However, climate projections have model uncertainties that overwhelm the uncertainties in greenhouse gas measurements. We present here an index that is directly proportional to the direct warming influence … supplied from these gases. Because it is based on the amounts of long-lived greenhouse gases in the atmosphere, this index contains relatively little uncertainty."