Reuters: G8 leaders have a 50-50 chance of agreeing next week on a global goal of halving greenhouse gas emissions by mid-century, a Japanese foreign ministry official said, adding that failure could hurt UN-led climate talks. Leaders meet for the July 7-9 Group of Eight summit in Hokkaido, northern Japan, and Prime Minister Yasuo Fukuda hopes to build momentum for talks on a global emissions framework before the Kyoto Protocol’s first phase ends in 2012. Fukuda also needs a …