The Brundtland Commission defined sustainabledevelopment as development that meets the \ud needs of the present without compromisig the ability of future generations to meet their \ud own needs (WCED, 1987). This entails various complexities that policy‐makers will have to deal with to attain this objective. The first complexity resides in \ud the need to optimise three values \ud (i.e. ecological, social, and economic) at \ud the same time. It also resides in the \ud observation that human behaviour \ud (including public policy) often affects each of these values simultaneously.\ud \ud
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