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Environmental scientists sometimes assume it is their work that moves governments. Think on. The Life and Death of Petra Kelly by Sara Parkin, now in paperback (Pandora, £9.99), tells another story: of the world’s most famous, most loved and arguably most powerful green politician. It has barely a word on science. Kelly’s green agenda was driven by human rights, antimilitarism and personal passion, all of them mocked by her death – shot by her lover, former NATO general Gert Bastion.