Australian Broadcasting Corporation: Japan wants the fight against global warming as a main topic of discussion at a Group of Eight (G8) nations summit this year. The Japanese Government took over the chairmanship of the G8 group of industrialised nations today. It also wants to discuss development in Africa, high oil prices and preventing nuclear proliferation at the summit. Talks on how best to reduce greenhouse gas emissions once the Kyoto Protocol expires look set to dominate events. The G8 …