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Indicator Assessment Atmospheric greenhouse gas concentrations (CSI 013) - Assessment published Oct 2005
The atmospheric concentration of carbon dioxide (CO 2 ), the main greenhouse gas, has increased by 34 % compared with pre-industrial levels as a result of human activities, with an accelerated rise since 1950. Other greenhouse gas concentrations have also risen as a result of human activities. The present concentrations of CO 2 and CH 4 have not been exceeded during the past 420 000 years and the present N 2 O concentration during at least the past 1 000 years. IPCC (2001) baseline projections show that greenhouse gas concentrations are likely to exceed the level of 550 ppm CO 2 -equivalent in the next few decades (before 2050).
Located in Data and maps › Indicators › Atmospheric greenhouse gas concentrations
Indicator Assessment Atmospheric greenhouse gas concentrations (CSI 013) - Assessment published Apr 2008
  The global average concentrations of various greenhouse gasses in the atmosphere reached their highest levels ever recorded, and continue increasing. The combustion of fossil fuels from human activities and land-use changes are largely responsible for this increase. The concentration in 2006 of the six greenhouse gases (GHG) included in the Kyoto Protocol has reached 433 ppm CO2 equivalent, which is an increase of 155 ppm compared to the pre-industrial level. Considering all GHGs (incl. ozone and various cooling aerosols), the concentration is 393 ppm CO2 equivalents, which is 115 ppm higher than in pre-industrial times. The concentration of CO2 - the most important greenhouse gas - has reached in 2006 a level of 381 ppm, showing an increase of 103 ppm compared to the pre-industrial level. Under the IPCC scenarios the overall concentration of the six Kyoto gasses is projected to increase up to 638-1360 ppm CO2 -equivalent by 2100, whereas the concentration of all GHGs may increase up to 608-1535 ppm CO2 -equivalent.  The global atmospheric GHG concentration of 450 ppm CO2-equivalent may be exceeded between 2015 and 2030.
Located in Data and maps › Indicators › Atmospheric greenhouse gas concentrations
EEAFigure Measured and projected concentrations of
Located in Data and maps › Maps and graphs
EEAFigure Measured and projected concentrations of 'Kyoto' greenhouse gases
Located in Data and maps › Maps and graphs
EEAFigure Observed and projected changed in the overall Kyoto gasses (Fig 1a) and all greenhouse gasses, expressed in CO2-equivalents (IPCC, 2007a, partly based on IPCC, 2001).
There is no historical trend in figure 1a due to the unavailability of long-term data for aerosols and ozone
Located in Data and maps › Maps and graphs
Uncertainties
CSI Specifications, section on uncertainties
Located in Data and maps › Custom lists
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