If there is a company that you believe is causing some harm, you can buy shares of that company and donate any proceeds to a charity that cancels out that harm.
For example, if you are worried about climate change, you can buy shares of an oil company and pledge to donate the proceeds to an organization lobbying for a carbon tax.
If the oil company does well, the carbon tax lobby will need more financing, which you'll be in a position to provide as a shareholder of the oil company.
If there is a company that you believe is causing some harm, you can buy shares of that company and donate any proceeds to a charity that cancels out that harm.
For example, if you are worried about climate change, you can buy shares of an oil company and pledge to donate the proceeds to an organization lobbying for a carbon tax.
If the oil company does well, the carbon tax lobby will need more financing, which you'll be in a position to provide as a shareholder of the oil company.
This idea was developed by economist Brigitte Roth Tran: https://www.federalreserve.gov/econres/feds/files/2017042pap... .
Hauke Hillebrandt also has a great write up: https://forum.effectivealtruism.org/posts/iZp7TtZdFyW8eT5dA/...