Bloomberg: Environment ministers of the Group of Eight industrialized nations pledged to cut emissions of gases blamed for global warming by half by 2050 and called on rich countries to lead the way. “In order to halve global emissions, developed countries should take the lead in achieving a significant reduction,” the ministers said in a joint statement at the end of a 3-day meeting in Kobe, Japan. The statement didn’t specify by how much the countries should cut emissions or whether …