Christian Science Monitor: Alternative energy is one of the hottest trends on Wall Street. But for America’s ethical investors, it mostly means buying stock in foreign firms. Now, companies in the United States are making a bid to take a bigger piece of the market. Is it time to invest in US alternative-energy funds? The Monitor’s Laurent Belsie recently talked about that possibility with Carey Callaghan, co-portfolio manager of American Trust’s Energy Alternatives Fund. Here’s an edited version of their …