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Valuation is an unavoidable discussion in any decision-making process regarding sustainability issues.
If we are able to have a single measure for sustainability, then it will be very straightforward to choose among different alternatives in conflicts – the more ‘sustainable’ option will be the best.
Single-dimensional approaches seek to derive a common and single unit to measure sustainability. We can distinguish between two types of single-dimensional approaches in evaluation.
Cost-benefit analysis is based on the monetary valuation of all impacts of a given project, adopting economic value as the single language of valuation.
Approaches based onone common physical indicator such as the ecological footprint, energy balances or material flow analysis are other single-dimensional approaches to sustainability assessment.