In a new edition of his hard-hitting book on climate change, economist Dieter Helm looks at how and why we have failed to tackle the issue of global warming and argues for a new, pragmatic rethinking of energy policy.   “An optimistically levelheaded book about actually dealing with global warming.”—Kirkus Reviews, starred review “[Dieter Helm] has turned his agile mind to one of the great problems of our age: why the world’s efforts to curb the carbon dioxide emissions behind global warming have gone so wrong, and how it can do better.”—Pilita Clark, Financial Times