On the topics of metrics and CSR or sustainability programs, we participate with the McKinsey Quarterly as executive members. MQ has several good pieces based on their interview with CEOs, COOs, and CSOs (sustainability officers). One good article is Valuing CSR Programs: https://www.mckinseyquarterly.com/Valuing_corporate_social_responsibility_McKinsey_Global_Survey_Results_2309. Login is required on the MQ site and some content may be limited. If you need a copy of the report in pdf format send me a message. Kind regards.