THE WORD "religion" is often used, rather effectively, to demonise a category of people who hold a strong conviction about something and propose to translate that belief into action. And John Howard, a former prime minister of Australia, used a lecture in London this week to denounce people who in his view exaggerate the certainty of global warming and demand urgent efforts to mitigate it. His talk was called "One Religion is Enough" and he explained that:
