This study examines rising alarm over waste of natural resources, and its use by Theodore Roosevelt and his administration to further objectives of conservation and an American form of empire. These objectives encompassed both preservationist and utilitarian approaches, centred on efficiency, but interpreting efficiency in social and political rather than economic terms. These policies revealed an emerging idea of environmental 'habitability' that presaged modern interest in sustainability.

Distinguishing four sources of power - ideological, economic, military and political - this series traces their interrelations throughout human history. This third volume of Michael Mann's analytical history of social power begins with nineteenth-century global empires and continues with a global history of the twentieth century up to 1945. Mann focuses on the interrelated development of capitalism, nation-states and empires. Volume 3 discusses the 'Great Divergence' between the fortunes of the West and the rest of the world; the self-destruction of European and Japanese power in two world wars; the Great Depression; the rise of American and Soviet power; the rivalry between capitalism, socialism and fascism; and the triumph of a reformed and democratic capitalism.