i wanted to build on k.mckercher's post below ( http://community.oen.org/people/kmckercher ). it introduces the idea that companies can do more good than simply make money for investors.
in a similar vein i wanted to introduce the concept that the INVESTMENT VEHICLE or INSTRUMENT iteslf can be an instrument of impact. see video: http://quuh.wordpress.com/2009/10/05/tides-momentum-conference/