HEILIGENDAMM, Germany - Group of Eight leaders including President Bush agreed Thursday to call for substantial global emissions reductions to fight global warming and cited a goal of a 50 percent cut by 2050. European leaders hailed the deal as progress in the wrangling between Europe and the United States over global warming, with the Europeans pushing mandatory cuts and the U.S. resisting. German Chancellor Angela Merkel, who shepherded the deal as chair of the G-8 summit in this seaside resort in northern Germany, called it "very great progress and an excellent result." With Bush resisting concrete cuts, it had...