Book excerpt: This exciting new reader in environmental history provides a framework for understanding the relations between ecosystems and world systems over time. Alf Hornborg has brought together a group of the foremost writers from the social, historical and geographical sciences to provide an overview of the ecological dimension of global, economic processes, with a long-term, historical perspective. Readers are challenged to integrate studies of the Earth system with studies of the World system, and to reconceptualize human-environmental relations and the challenges of global sustainability. Immanuel Wallerstein, renowned Yale sociologist and originator of the world-system concept, closes the volume with his reflections on the intellectual, moral, and political implications of global environmental change.