The Ontario Teachers’ Pension Plan has signed the the United Nations’ Principles for Responsible Investment (PRI) according to a recent post on its Web site. The principles provide a voluntary framework for incorporating environmental, social and governance (ESG) issues into investment decision-making and ownership practices. According to the Teachers’ Web site “As of April 2011, more than 900 asset owners, investment managers and professional service partners have signed on to the Principles, representing approximately US$25 trillion in assets under management. Ontario Teachers’ Pension Plan is pleased to be part of this growing global network of investors who are exploring and acting on ESG issues as they impact the analysis of investment risks and opportunities.”