"Non-financial performance measurement and a lack of international standards have been identified as the biggest hurdle for environmental, social and governance (ESG) investing."

[COMMENTARY]BNY Mellon have hit on an old and familiar theme with their study. However, as addressed in their findings, there’s a great deal of work by regulators and others behind the scenes attempting to remedy the situation. I believe in future years we’ll see such remedies.
Lack of international standards holding back ESG investing, finds BNY Mellon study, by Joe Parsons, November 22, 2018, Global Custodian, UK.