Alternative energy mutual funds (MF) racked up extremely robust gains in the past year. Returns range from a low of 16 percent, to a high of 64 percent for a mutual fund that is heavy into solar investments. Exchange traded funds (ETF) also did well, but returns are much more variable. They range from a loss of 34 percent for a carbon ETF, to more than doubling of a solar ETF.

Alternative energy mutual funds (MF) racked up extremely robust gains in the past year. Returns range from a low of 16 percent, to a high of 64 percent for a mutual fund that is heavy into solar investments. Exchange traded funds (ETF) also did well, but returns are much more variable. They range from a loss of 34 percent for a carbon ETF, to more than doubling of a solar ETF.

Alternative energy mutual funds (MF) racked up extremely robust gains in the past year. Returns range from a low of 16 percent, to a high of 64 percent for a mutual fund that is heavy into solar investments. Exchange traded funds (ETF) also did well, but returns are much more variable. They range from a loss of 34 percent for a carbon ETF, to more than doubling of a solar ETF.