It seems like the entire business world is rushing to put money into the issues encompassed by the acronym "ESG" — it stands for environmental, social and governance, and has become something of a catchall for conscientious and sustainable investing. But that can come with a lot of questions: Will this affect asset values? What exactly do we tell shareholders? Does this even make fiscal sense? Étienne Cadestin is one of the people in the room with asset managers controlling billions of dollars, and he explains how it works.