CSR: Corporate Social Responsibility

From https://en.wikipedia.org/wiki/Sustainability_reporting#Initi... :

>> Organizations can improve their sustainability performance by measuring (EthicalQuote (CEQ)), monitoring and reporting on it, helping them have a positive impact on society, the economy, and a sustainable future. The key drivers for the quality of sustainability reports are the guidelines of the Global Reporting Initiative (GRI),[3] (ACCA) award schemes or rankings. The GRI Sustainability Reporting Guidelines enable all organizations worldwide to assess their sustainability performance and disclose the results in a similar way to financial reporting.[4] The largest database of corporate sustainability reports can be found on the website of the United Nations Global Compact initiative.

The GRI (Global Reporting Initiative) Standards are now aligned with the UN Sustainable Development Goals (#GlobalGoals). https://en.wikipedia.org/wiki/Global_Reporting_Initiative

>> In 2017, 63 percent of the largest 100 companies (N100), and 75 percent of the Global Fortune 250 (G250) reported applying the GRI reporting framework.[3]

> How can I score a candidate portfolio with sustainability metrics in order to impact invest with maximum impact?

Does anybody have solutions for this? AFAIU, existing cleantech funds are more hand-picked than screened according to sustainability fundamentals.