This work places the contemporary debate over green issues in its historical context. Outlining the ideas and values which have led to the present crisis, Peter Marshall traces the development of ecological thought from its origins in ancient religions and philosophies, to modern science and ethics. Informed by sound research and meticulous scholarship, this is an accessible guide to green politics, environmentalism and ecology. It provides the wider ecological movement with a comprehensive vision which will lay the foundations of an organic and sustainable society in harmony with nature.