Reuters: Prospects that the G8 would reach a meaningful agreement to how best to fight global warming at their annual summit dimmed on Sunday as leaders began arriving in northern Japan with a raft of global problems on their minds. Climate change is high on the agenda of the July 7-9 summit of rich nations at a luxury hotel in Toyako, Hokkaido, and of a Major Economies Meeting on July 9 that brings the G8 together with eight other countries including China, India and Brazil. Global …