Age: MARGARET Thatcher was an unlikely hero for a climate change movement that’s sometimes accused of left-wing, quasi-religious crusading. The day before the Berlin Wall fell in 1989, the Tory British prime minister stood in the United Nations General Assembly and, acknowledging that Cold War hostilities were receding, declared a new war against ”another insidious danger” – global warming. Fine words, but her more practical contribution was to spend a bloody year grinding …