Figure 1 -

Global average radiative forcing (RF) estimates and uncertainty ranges in 2005, relative to the preindustrial climate, for anthropogenic carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O) and other important agents and mechanisms, together with the typical geographical extent (spatial scale) of the forcing and the assessed level of scientific understanding (LOSU). The total anthropogenic radiative forcing and its associated uncertainty (5–95% confidence interval) are also shown¹. Added to the figure (green bar at bottom and associated uncertainty range) is the estimate from the 2001 IPCC report² of the total forcing projected for 2100, where the uncertainty denotes the range of estimates for different emission scenarios.