Expressed as CO2-equivalents, emissions reductions achieved
by different mitigation actions can be compared and if the costs
of implementing the actions are known, their cost-effectiveness
can be determined and compared (Moomaw et al., 2001). The
benefits of adaptation are more difficult to express in a single
metric, impeding comparisons between adaptation efforts.
Moreover, as a result of the predominantly local or regional
effect of adaptation, benefits of adaptation will be valued
differently depending on the social, economic and political
contexts within which they occur