The concept of 'Natural Capital' has come to play a central role in current debates about biodiversity and nature conservation. It implies an approach to the natural world based on the valuation of places and species in terms of money. This is, in a variety of ways, both attractive and problematic. This edited collection comprehensively discusses the issues raised by the concept of 'Natural Capital', with contributors presenting not only arguments for and against the widespread adoption of the idea, but also viewpoints arguing for nuanced, pragmatic and middle-ground positions.