In early 2014, the senior vice-president of the Ontario Teachers' Pension Plan is considering two investment opportunities in the oil and gas industry brought forward by his team. He is trying to understand how to ensure that the principles underpinning responsible investing are incorporated in the decision about which to choose. Each investment looks very attractive, but a growing stream of controversies surrounding oil sands extraction, pipeline safety and environmental protection has raised concerns. He faces multiple questions: How can the impact of these environmental, social and governance issues be quantified precisely? Can they be translated into an informed investment decision that the organization's stakeholders will accept? What approach to responsible investing is appropriate for a pension fund? What alternative methods of incorporating these issues into the investment decision process should be considered?