Reuters: G8 rich nations and major emerging economies probably won’t achieve a big breakthrough in talks on global warming in Japan next month, Britain’s climate envoy said on Thursday, echoing other forecasts for modest progress at best. Climate change is a key topic for the July 8 Group of Eight leaders’ summit as well as an expanded meeting the next day with heads of eight other major economies including China and India. But doubts persist as to whether and how far the leaders will …