Figure 1. Comparison between global mean surface temperature anomalies
(¡C) from observations (thick black line) and AOGCM simulations forced with (a) both
anthropogenic and natural forcing and (b) natural forcing only (thick gray
line).
Source: IPCC (2007) Climate Change 2007 - The Physical Science Basis, Cambridge:
Cambridge University Press. Figure
9.5 in Working Group I Contribution to the Fourth
Assessment Report of the IPCC, Chapter 9: ÒUnderstanding and Attributing Climate Change,Ó p. 684.