Agence France Presse: Britain’s negotiator on climate change warned Thursday that the upcoming summit of the Group of Eight rich nations was unlikely to reach a consensus on how to tackle global warming. “We should be careful not to expect too much of the conversations next week,” John Ashton told reporters in Tokyo ahead of the July 7-9 summit in the northern resort of Toyako. “We are not going to have a major breakthrough in the global effort on climate change because the conditions …