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Data Visualization

Observed trends in total greenhouse gas concentration levels between 1860 and 2018, considering all greenhouse gases and other forcing agents (including aerosols)

Data Visualization Created 03 Dec 2020 Published 10 Dec 2020 Last modified 10 Dec 2020
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Methodology

Observed trends in greenhouse gas concentration levels. Greenhouse gases differ in the way they affect the climate system. In order to sum the effects of the individual greenhouse gasses and other forcing agents in the atmosphere, the so-called ‘greenhouse gas equivalent concentration’ has been defined. This is the concentration of only CO2 that would cause the same amount of radiative forcing as a mixture of CO2 and other forcing agents (greenhouse gases and aerosols).

Units

parts per million in CO2 equivalents (ppm CO2 eq).

Data sources

CO2 concentration provided by National Oceanic and Atmospheric Administration (NOAA)
CH4, N2O, HFCFCs, CFCs concentration provided by Advanced Global Atmospheric Gases Experiment (AGAGE)

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