Australian Broadcasting Corporation: Climate change campaigner Al Gore says he is still optimistic an agreement to reduce carbon emissions can be finalised at global climate talks later this year in Denmark. At the G8 leaders meeting in Italy, Prime Minister Kevin Rudd told his Danish counterpart that he fears the talks are not on track for a deal. Speaking at a conference in Melbourne, Mr Gore said he was confident that a substantial agreement can be reached. "I choose to be very optimistic," he …