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NOAA developed the Annual Greenhouse Gas Index (“AGGI” for short). Updated yearly, the AGGI compares the combined warming influence of the long-lived greenhouse gases — atmospheric gases that absorb and radiate heat — to their influence in 1990. They chose 1990 because that is the year that countries who signed the U.N. Kyoto Protocol agreed to use as a benchmark for their efforts to reduce emissions. By the end of 2020, the warming influence of human-produced greenhouse gases had risen 47 percent above the 1990 baseline.