Guest: Sarah Keyes

Environmental, social and governance metrics have been a going concern for investing for close to 20 years, but what do these metrics actually mean? And who determines how an investment qualifies as "green" or "sustainable?"

Sarah Keyes is the CEO of ESG Global Advisors. In this episode of "Responsible Investing for a Sustainable Economy," she walks host Tim Nash through new and developing guidelines and ratings being set up for ESG investing. She believes that ESG funds are moving out of their awkward teen years and into adulthood — with all the growing pains that comes with.