Agence France-Presse: A pitched battle over climate change took off Wednesday in the US Senate, as leading Democratic lawmakers unveiled a bill unlikely to be completed before a key international conference in December. “We need to act now and get the job done,” Democratic Senator John Kerry, chairman of the Senate Foreign Affairs Committee, told a crowd of over 300 environmental activists who gathered on the Capitol lawn. “Our security and our economy will both be strengthened. We can’t afford not …