I’m skeptical about efforts to rank and rate green or sustainable companies, and I have been for a time. [See 100 Best Corporate Citizens? What a CROck!] It’s terribly difficult to compare big and small companies, retailers with manufacturers, software firms with oil companies, etc. We once tried at FORTUNE, and gave up because we decided it couldn’t be done right.

Having said that, I’m impressed with the rigor and methodology used by a Canadian magazine called Corporate Knights to produce its 8th annual list of Global 100 Most Sustainable Companies, which it calls “the most extensive data-driven corporate sustainability assessment in existence.” The ratings are transparent and they encompass social as well as environmental metrics, among them energy, carbon, waste and water productivity, diversity and employee turnover, safety and, interestingly, the ratio between CEO and average worker pay–a revealing metric that most such rankings do not include. Disclousre: While I played no part in putting the list together, I did write a profile of Novo Nordisk, the top-ranked company, for Corporate Knights.

Read the full article here: http://sustainablebusinessforum.com/marcgunther/56212/ratings-rankings-and-world-s-most-sustainable-company

http://www.greenbiz.com/blog/2012/01/27/worlds-best-greenest-companies-list?page=0%2C1