More than any other investment bank, Goldman Sachs (NYSE:GS) is famed for its skill at picking good investments. Last week, the bank announced it would invest another $40 billion in green technologies over the next 10 years (or an average of $4 billion a year.) While this is a drop from the $4.8 billion invested in 2011, the last time Goldman Sachs made a commitment to green tech was 2005. The $1 billion pledged then ended up as $4 billion in direct investments of Goldman's own money, and another $24 billion of financing arranged by the bank.