Associated Presss: Japan’s incoming prime minister promised Monday to aim for a 25 percent reduction in greenhouse gas emissions by 2020 — among the most ambitious cuts proposed by an economic power and significantly more aggressive than the current plan. The reduction, which will be measured from 1990 levels, was immediately hailed by environmentalists, who are watching target proposals closely ahead of a major international climate conference in December. Prime Minister Taro Aso’s current plan was to …