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Environmental information systems
Observed trends in total greenhouse gas concentration levels between 1860 and 2021, considering all greenhouse gases and other forcing agents (including aerosols)
Chart (static)
Notes:
- The figure shows the global average concentration of greenhouse gases in the atmosphere. Plus two peak concentrations that correspond to a 67% probability of limiting the increase in global mean temperature to 1.5°C and 2.0°C.
- Data are expressed in ppm CO₂e (parts per million CO₂ equivalent).
Downloads
Data sources
Metadata
More info
- AGAGE Data & Figures, Advanced Global Atmospheric Gases Experiment (AGAGE)
- Greenhouse Gases (NOAA), National Oceanic and Atmospheric Administration (NOAA)
The figure includes the contribution of gases covwered by Kyoto Protocol (KPG), gases, and the Montreal Protocol (MPG) and other forcing agents, such as ozone and aerosols (here called non-protocol gases).
Methodology
The global concentration and forcing from different greenhouse gases and other agents have been taken from literature/data sources. They have been added by using Radiative forcing (see methodology section), and that back to ppm CO2e by the forcing of CO2.