19. The six alternative scenarios IS92a-f of 1992.
The projection of future climate change depends partly on the assumptions made about future emissions of greenhouse gases and aerosol precursors and the proportion of emissions remaining in the atmosphere.
In 1992 the IPCC worked out six alternative scenarios termed IS92a-f. These scenarios describe the future development paths in various sectors such as energy, and estimate the emissions of greenhouse gases. This table gives a summary of the assumptions in the six emission scenarios. New scenarios were adopted in 2000. (A graphic depicting the new scenarios will be added later.)