Agence France-Presse: Prime Minister Gordon Brown on Friday called for upcoming climate talks in Copenhagen to launch a 10-billion-dollar fund to help developing countries tackle global warming. Brown, who outlined the proposal in broadcast interviews with British journalists ahead of a Commonwealth summit in Trinidad, was "optimistic" it would be adopted, according to his official government website. Britain would contribute 1.3 billion dollars to the fund over three years, he said. The plan …