"Green" exchange traded funds (ETFs) seem to be benefiting from investors’ growing environmental conscientiousness. For example, PowerShares WilderHill Clean Energy (PBW) has been one of the top performing ETFs for the year so far. It’s up 19.8% year-to-date. However, green ETFs can be affected by the demand for traditional energy. Also, some experts worry that the interest in alternative energy funds is outpacing demand and could lead to a bubble in certain sub-industries, reports Farnoosh Torabi for Entrepreneur Magazine.

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