NOAA Annual Greenhouse Gas Index, 2021

Date01 July 2022
NOAA Annual Greenhouse Gas Index, 2021
Greenhouse ga s pollution trappe d 49% more heat in 2021 than in 1990, NOAA finds , NOAA RESEARCH NE WS, May 23, 2022, at http s://
This graphic sh ows the increasing war ming influence over time o f CO2 and non-CO2 greenhouse gases , in CO2 equivalents, on t he left axis. The c orresponding
increase in th e AGGI is shown on the right a xis. Credit: NOA A Global Monitorin g Laboratory.
Global averag e abundances of the ma jor, well-mixed, long -lived greenhouse ga ses—carbon dioxid e, methane, nitrous ox ide, CFC-12 and CFC-11—from the
NOAA global a ir sampling netwo rk since the beginni ng of 1979 are depicted here. Thes e five gases account for a bout 96% of the direct radiat ive forcing by
long-lived g reenhouse gases sin ce 1750. The remainin g 4% is contributed by 15 other hal ogenated gases inc luding HCFC-22 and HFC -134a, for which N OAA
observat ions are also shown here. C redit: NOAA Globa l Monitoring Labor atory.
Copyright © 2022 Environmental Law Institute®, Washington, DC. Reprinted with permission from ELR®,, 1-800-433-5120.

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