Agence France-Presse: British Prime Minister Gordon Brown Friday called for a global fund worth 100 billion dollars a year to tackle climate change in the developing world, ahead of crunch talks later this year. Brown warned that “the earth itself will be at risk” unless a conference in Copenhagen in December — which aims to strike a new agreement on rolling back global warming — reaches a strong accord. “If we are to achieve an agreement in Copenhagen, I believe we must move the debate from a …