If you want to incentivise shareholders to go green, it’d imo actually help more to have tax deductions for investing in those, while you raise dividend tax on non-SRI (socially responsible investing). The extra dividend tax can go towards three:

a) making sure algorithms and media foster general wellbeing, so, corporate can’t lobby as effectively, thus hindering the far right

b) financing public projects and works, independently managed sovereign wealth funds with a strong ESG, SRI focus

c) fostering cooperatives and building financial reserves for crisis years