1. Sustainable Development Goalshttps://www.un.org/sustainabledevelopment/sustainable-development-goals
2. The Paris Agreementhttps://unfccc.int/process-and-meetings/the-paris-agreement/the-paris-agreement
3. Principles for Responsible Investment; An investor Initiative in Partnership with UNEP Finance Initiative and the UN Global Compact,2018
4. Closing the Loop—An EU Action Plan for the Circular Economy; Brussels, Belgiumhttps://www.eea.europa.eu/policy-documents/com-2015-0614-final
5. Making Real Options Really Work;Van Putten;Harvard Bus. Rev.,2004