Reuters: China’s President Hu Jintao may lay down a “carbon intensity” target for his country at a top level United Nations summit on Tuesday, experts said, as he seeks to show Beijing’s commitment to fighting climate change. A pledge from the world’s biggest emitter to cut the amount of greenhouse gasses produced for each dollar of national income — while short of an absolute cap on output — would counter critics of Beijing who says it is taking too little action. It could also …