FIGURE SPM-1. Changes in Greenhouse Gases from ice-Core and Modern Data

Atmospheric concentrations of carbon dioxide, methane and nitrous oxide 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 are shown on the right hand axes of the large panels.

Bron: IPCC Climate Change 2007:  The Physical Science Basis, Summary for Policymakers (2007), p3