Street Clears the Air

Going green could bring a lot of green to investors and investment banks.

Fast-emerging opportunities to trade carbon dioxide -- the gas linked to global warming -- are moving it into the limelight.

And Wall Street firms better known for making a bundle trading traditional commodities such as natural gas and oil are seeing an opportunity to make money from efforts to clean up the environment.

Morgan Stanley(MS Quote) announced last week that it is committing $3 billion over five years to expand its existing carbon and emissions trading business, including private equity investments in projects related to emissions reduction. ...