2. Study design and scenario set-up
In this study, we employ a subset of AMPERE WP2
scenarios that is generally consistent with a concentration
target of 450 ppm CO2e (2.6 W/m2) in 2100, corresponding
to a cumulative emission budget over the period 2000 to
2100 of 1500 GtCO2.2 We combine this with two alternative
near-term climate policies through 2030 and five technology
sensitivity experiments.
The two near-term climate policies are:
1. Optimal short-term emissions (OPT) and
2. Emissions limited to 60.8 GtCO2e per year in 2030 (HST3).
Note that the OPT pathways are model-specific and that
the HST scenarios are calculated in terms of Kyoto greenhouse
gases [17].4 After the year 2030, models have full