Agence France-Presse: The US Senate’s two principal authors of legislation to battle climate change said Tuesday they were putting the last touches on their bill and hoped to unveil it next week. “I feel very optimistic about the progress that we’re making. I think that folks are coming together, but there are still some hurdles,” said Senate Foreign Relations Committee chairman John Kerry, a Democrat. Asked when he and Republican Senator Lindsey Graham would make the measure public, Kerry replied: …