Worse than worst case...
Carbon dioxide emissions from fossilfuel burning and industrial processes is accelerating not only in industrialized countires, but at a global scale. The emissions growth rate has been over 3 per cent for the present decade, compared to 1.1 per cent during the 1990s. Since 2000 the emissons have exceeded the projections in the most fossil-fuel intensive scenario of the IPCC, the A1F1 scenario, projecting a global mean temperature increase of 2.4-6.4 °C by the end of this century. The graph is from a scientific article by Michael Raupach and others, published 2007. Emission data has been updated for 2006 and 2007. All emisson data is from CDIAC, a body under the US Department of Energy.
Source: Raupach, M R et al 2007: Global and regional drivers of accelerating CO2 emissions. PNAS, vol. 104:24, p.10288-10293.
Actual global greenhouse gas emissions compared to two IPCC scenarios and to the development needed to stabilize atmospheric greenhouse gas concentration at 650 ppm.