IPCC Fourth Assessment Report: Climate Change 2007
Climate Change 2007: Synthesis Report

Changes in GHGs from ice core and modern data

Figure 2.3

Figure 2.3. Atmospheric concentrations of CO2, CH4 and N2O over the last 10,000 years (large panels) and since 1750 (inset panels). Measurements are shown from ice cores (symbols with different colours for different studies) and atmospheric samples (red lines). The corresponding radiative forcings relative to 1750 are shown on the right hand axes of the large panels. {WGI Figure SPM.1}