redOrbit: Japan announced plans on Wednesday that would scale back its greenhouse gas emissions reduction target by 15 percent by 2020. Japanese Prime Minister Taro Aso said the plan, which is based on a 2005 base year, was uniform with others initiated by the US and Europe. “We all must make a commitment to tackle the problem of global warming,” Aso said Wednesday. However, environmentalists have been outspoken in their criticism of Aso’s new reductions target. Leading …