ESG integration is most likely enforced by regulating:

Corporate disclosure is a primary focus of ESG regulation. Requiring companies to disclose their ESG practices ensures transparency and allows investors to make informed decisions. Regulations around stewardship and asset owners often complement these disclosure requirements but are not the main enforcement mechanism for ESG integration.ESG Reference: Chapter 7, Page 364 - ESG Analysis, Valuation & Integration in the ESG textbook.