Dominic Barton, the global managing partner of McKinsey&Company, discusses the firm\u2019s sustainability efforts. He talks about the wake-up call he got about sustainability and how he tries to convince CEOs hesitant to make it part of their business model that doing so will improve company performance. He says he sees companies thinking about the environment. \u201cBut the speed and scale of what we need to do \u2014 I don\u2019t think it\u2019s sufficient.\u201d