Independent: It could be called talking-shop tourism. Representatives of all the countries of the world gather, under the auspices of the United Nations, to discuss climate change. They meet in cities that hope to lend their names to international agreements. There was Rio de Janeiro and Kyoto. Last year it was Bali; next year it is Copenhagen. Last week it was Poznan. Apart from introducing the former capital of Greater Poland to a travelling circus of politicians, officials, journalists and hangers-on, …