Associated Press: Behind the millions of words at the Bali climate conference, in documents, speeches and slick brochures, lay a set of simple numbers: 2 and 445 and "25 to 40." That’s 2 degrees Celsius, 445 parts per million of carbon dioxide, and a 25-to-40-percent reduction in global-warming gases – a formula, some say, to save the planet from climate change’s severest consequences. In the end, at U.S. insistence, none of those numbers appeared in the U.N. conference’s key final …