Bloomberg: Japan, the world’s fifth-biggest greenhouse-gas polluter, is building a new emissions market as the widest carbon-trading spreads in four months signal the 1997 Kyoto climate agreement will be scrapped. Credits for 2012 in the United Nations market, set up after the Kyoto accord, traded at 3.95 euros ($5.50) less than those in the European Union’s cap-and-trade program as of Nov. 3. That’s the biggest difference since June 14 and compares with 2.39 euros at the start of the year. Traders are…