BRITISH environmentalists were in their political pomp in the middle of the past decade. Prosperity allowed voters to worry about an issue they used to regard as esoteric: Ipsos mori polls found 19% of the public citing pollution as a serious issue facing the country in early 2007. Then in opposition, David Cameron, the Conservative leader, sought to capture the Zeitgeist, and fix his party's "uncaring" image, by visiting melting glaciers and changing the Tory logo from a torch to a tree.
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