Agence France-Presse: Climate change campaigners called Sunday for greater effort in the fight against global warming, saying the world was waiting for a crunch UN conference in Bali to produce a breakthrough. Prominent figures including Nobel-winning former US vice president Al Gore and UN chief Ban Ki-moon are due to arrive on the Indonesian resport island in the coming days as the climate change summit enters its crucial final week. “The whole year has been pointing at the Bali …