Critically synthesising a range of disparate literatures and debates, this book asks what is at stake in mounting a decisive response to the 'socio-ecological crisis' - a crisis of humanity's relationship with the rest of nature that places social life as we know it in jeopardy. Martin Craig proposes that political economists within and beyond the field of political ecology make an indispensable contribution to the diagnosis of this crisis and the formulation of prescriptions for its resolution. In a wide-ranging yet concise exposition, he assess the fraught relationship between capitalist societies and the biosphere of which they are a part, and urges a renewed emphasis on political-economic structure and strategy when considering responses to the crisis. The result is a proposal for a critical yet inclusive research enterprise - 'ecological political economy' - within which a wide variety of researchers can readily participate.