Environmentalism ? defined here as activism aimed at protecting the environment or improving its condition ? is undergoing significant change in the United States. Under attack from the current administration and direct questioning from its own ranks, environmentalism in the US is at a crossroads. This special issue will explore the changing patterns of and challenges to environmentalism in the contemporary US. More specifically, it will examine the following dynamics:· the re-conceptualisation of core ideas and strategies defining US environmentalism;· questions of identity and relations with other advocacy groups (including labour, global justice and women?s groups);· institutional change (especially the shift away from regulatory policies and approaches);· the expanding arenas of activism, to both above and below the state;· environmentalists? response to Bush administration policies and priorities.This book was previously published as a special issue of Environmental Politics.