Table 8 Main global characteristics of the IPCC A1b and B2 baseline scenarios (derived from The IMAGE Team [59]).
Variable | Year | A1b | B2 |
|---|---|---|---|
Population | 2020 | 7.6 | 7.7 |
(109 people) | 2050 | 8.7 | 9.4 |
(in 2000: 6.1) | 2100 | 7.1 | 10.4 |
GDP/capita | 2020 | 8.8 | 7.6 |
(103 US $ yr-1) | 2050 | 24.2 | 13.7 |
(in 2000: 5.3) | 2100 | 86.2 | 27.7 |
Extent arable land | 2020 | 51.7 | 53.1 |
(Mkm2) | 2050 | 53.1 | 53.6 |
(in 2000: 48.5) | 2100 | 48.4 | 51.0 |
Atmospheric CO2 | 2020 | 426 | 421 |
Concentration (ppm) | 2050 | 561 | 506 |
(in 2000: 375) | 2100 | 753 | 606 |
Air temperature change (°C) (in 2000: 0.6) | 2020 | 1.0 | 1.0 |
| Â | 2050 | 2.0 | 1.9 |
| Â | 2100 | 3.4 | 2.9 |