Smaller boutiques specialise in this area. They will lack the brand name, but will claim that they have been involved in green consulting far longer than any brand name, thus they have the proven experience and are not new entrants.In this climate, you really have to show quick wins and benefits, gone are the days of idealistic 'thought leaders' ( unless you work at the very top). Companies was pragmatic and quick ways of becomming greener, even of it is small steps.