The outlook for alternative energy isn’t necessarily better because of falling oil prices, analysts say. PR Newswire/Associated Press These are dark days for investors in Big Oil. That doesn’t mean clear skies for investors in clean energy. The sharp plunge in oil prices has dragged down the share prices of many global energy giants. But a number of companies that provide alternatives to fossil fuel have taken a similar hit. U.S. oil prices have fallen 15% this month through Wednesday, and the $10.6 billion Vanguard Energy Fund , a mutual fund that holds shares in large oil and gas producers, has fallen 4.9%. In the same period, the New Alternatives Fund, one of the largest mutual funds focused on alternative energy, is down 6.2%. Government policies and social acceptance may support the investment argument for more environmentally friendly energy sources. But […]