Agence France-Presse: Japan will study introducing a cap-and-trade system for greenhouse gas emissions, officials said Thursday, as the business community hinted it will back down on its opposition amid global pressure. Japan, despite its advocacy of the Kyoto Protocol named after its ancient capital, is far behind on meeting its own obligations under the treaty as its economy recovers from recession in the 1990s. Japan is hoping to show its role as a leader in the fight against global warming when …