Reuters: Japan, the world’s fifth-biggest greenhouse gas emitter, can target deeper cuts in carbon dioxide emissions than first thought, a trade ministry panel said on Tuesday. It said emissions could be cut by 30 percent or more by 2030 from 1990 levels, greater than a figure of 21 percent the government had mentioned last August in its long-term energy outlook. Japan has said it will target a cut in greenhouse gas emissions by 25 percent by 2020 if all major emitters, such as China …