File:Figure 5.1 - Projected global annual CO2 emissions, 1990-2100, used to run models for the IPCC AR4.png

Total global annual CO2 emissions from all sources (energy, industry, and land-use change) from 1990 to 2100 in Gigatonnes of carbon/year (GtC/yr) for the four emission families (A1, A2, B1 and B2) and the six scenario groups (A1F1, A1T, A1B and A2, B1 and B2) (1Gt = 109 metric tonnes). The 40 scenarios are represented by the four families (A1, A2, B1, and B2) and the six scenario groups. The fossil-fuel-intensive A1FI (comprising the high-coal and high-oil-and-gas scenarios) has the greatest emissions. Each coloured emission band shows the range of scenarios within each group. The solid and dashed lines within each scenario represent the paths of illustrative marker scenarios.