Green Offshoots

Mr. Casasnovas, an employee of SmartRoofs L.L.C., was doing routine maintenance on the vegetative roof, which his company installed in June 2003. The company, based in the Bronx, is one of the few green roofers in the New York metropolitan area. But what makes SmartRoofs even more unusual is that it is part of a tiny but growing trend among small businesses: for-profit ventures spun off by nonprofit groups that teach the job skills necessary to join the nascent green economy.