Bloomberg: The introduction of carbon permits trading on the Tokyo Stock Exchange Inc. will hinge on a government plan for compulsory emission curbs, Atsushi Saito, the president of the world’s second-largest bourse, said. Japan aims to start emissions trading on a trial basis as part of the plan to slash gases blamed for global warming by as much as 80 percent by 2050, Prime Minister Yasuo Fukuda said this month. He stopped short of saying whether the country would impose mandatory caps for …