1. The SRES A2 and B2 emission scenarios were developed by Nakicenovic et al. (2000) and represent two representative samples out of a large family of scenarios. The A2 story line describes a very heterogeneous world. The underlying theme is self-reliance and preservation of local identities. Fertility patterns across regions converge very slowly, which results in continuously increasing population. Economic development is primarily regionally oriented, and per capita economic growth and technological change are more fragmented and slower than in other storylines. The B2 story line describes a world in which the emphasis is on local solutions to economic, social, and environmental sustainability. It is a world with continuously increasing global population, at a rate lower than A2, and intermediate levels of economic development and of technological change. Although the scenario is also oriented toward environmental protection and social equity, it focuses on local and regional levels. Because of higher population and slow technological advances, the A2 scenario results in one of the highest levels of CO2 emissions, whereas B2 represents an intermediate-level emission scenario.

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