Portfolio 21 is proving that it's easy being green – and seeing green. The New York-based environmental-friendly mutual fund just released its top 10 financial performers – and they returned between 52% and 120% last year, according to GreenBiz.com. These hot companies include Energy Conversion Devices, Mitsubishi Electric, Whole Food Markets and Vestas Wind Systems, among others. "If you are a savvy investor," Portfolio 21 co-founder Carsten Henningsen told GreenBiz.com, "you need to pay attention to ecological trends and how they affect the bottom line. The bottom line for everyone: You don't need to be green to get in on a good thing.