The costs of climate change policies are estimated and their implications discussed in many parts of the IPCC’s Assessment Report. The use of consistent cost concepts across the TAR is important, in order to facilitate comparability across different cost assessment approaches. In this guidance paper, we propose a set of definitions for the different concepts and present a relation between them. We suggest that, in every case where costs are referred to, authors make clear which cost concept or concepts they are using. The paper also identifies categories of costs and their relevance in the climate change area. We also suggest that authors use this as a checklist when estimating or referring to the costs of certain measures. Finally, the paper discusses the relationship between cost concepts and baselines. Again, authors are recommended to make clear what cost assumptions underlie the baselines they use

Author names: 
Markandya, A.
Halsnæs, K.

Markandya, A.; Halsnæs, K. (n.d.). Costing Methodologies. In T. Pachauri, T. Taniguchi, & K. Tanaka (Eds.), Guidance Papers on the Cross Cutting Issues of the Third Assessment Report of the IPCC (pp. 33–51). Geneva: World Meteorological Organization.

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