Uncertainty is ubiquitous in environmental economics: the field studies interactions between socio-economic and biogeochemical systems and neither is fully understood. So our grasp of their interactions is necessarily limited. We argue that this pervasive uncertainty is best modeled as ambiguity...

Economic evaluation of climate policy traditionally treats uncertainty by appealing to expected utility theory. Yet our knowledge of the impacts of climate change may not be of sufficient quality to justify probabilistic beliefs. In such circumstances it has been argued that the axioms of...

Uncertainty is intrinsic to climate change: we know that the climate is changing, but not precisely how fast or in what ways. Nor do we understand fully the social and economic consequences of these changes, or the options that will be available for reducing climate change. Furthermore the...