From Transnational Institute: Commentary on Public Banks and "Green" Funding

 https://eprints.soas.ac.uk/24844/1/How%20Public%20Banks%20Can%20Help%20Finance%20a%20Green%20and%20Just%20Energy%20Transformation_Marois_TNI_2017.pdf

As examples, two banks are discussed:  Germany's KfW; and Costa Rica's BPDC.  The report is both interesting and informative; it covers the good side of the issue and the shortcomings.  At least read the "Conclusion...", starting on page 12.

Green projects, like everything else, have to be funded.  Public banks should be involved because, in general, they're more accountable than the private banks.  Plus, public banks are much more democratic, and again in general, more concerned with the public good.

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Not only my opinion.  Be Well