Boston Business Journal: Six months after Massachusetts and nine other Northeast states launched the country’s first cap-and-trade system for limiting carbon dioxide emissions during energy generation, the system has generated $45 million for local energy conservation efforts and succeeded to the point that advocates are hailing it as a national model. “I think we’ve come a very long way in a year. We’ve gotten tremendous participation in the market,’ said Jonathan Schrag, executive director of RGGI Inc., the …