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Responsible investing - just a marketing trick?
A share is just a part ownership of a company. If you buy a share of a green stock in the open market, you now just own  part of a green company. Just like if you buy a house, the money you paid moves to the former owner, but what you are getting is a clear asset in return that you now own. Via mutual funds/indexes this can get a little more complicated (voting rights etc tend to go to the mutual/indexing company rather than the holders of the fund), but is approximately the same thing: the fund buys assets on the open market, then holds them, buys more, or sells them on behalf of the fund investors.