Reuters: Asia Pacific leaders backed away on Saturday from supporting a global halving of greenhouse gas emissions by 2050, even as Brazil pledged deep cuts of its own over the next decade. An initial draft leaders’ statement from an Asia Pacific Economic Cooperation (APEC) summit in Singapore had said that "global emissions will need to … be reduced to 50 percent below 1990 levels by 2050." But a later, watered-down version stated: "We believe that global emissions will need to peak …