ClimateBiz: You don’t hear much about Africa during the global debate over climate change policy. The world’s big greenhouse gas emitters — China, the U.S., Europe, Russia and India — get most of the attention, for obvious reasons. But Africans may already have begun to suffer the impacts of climate change: Some people including Jared Diamond and U.N. chief Ban Ki Moon say the war in Darfur is the world’s first climate-related conflict. So Africans would be beneficiaries of a new emphasis on finding …