Significant climate change as a consequence of human pollution of the atmosphere looks increasingly likely. Some change is already occurring but quite what magnitude of change will occur and what it will bring to different parts of the world remains unknown. Meanwhile, despite the catastrophic forecasts of the dangers that a warming world poses to human and other species, the consumer society of the North continues in its energy hungry path, and the peoples of the South continue to bear the cost. In the face of this uncertain yet impending crisis, does it make sense to speak of a moral response? Michael Northcott argues not only that it does, but that it is essential if we are to avoid further environmental disaster.