[AlanSE]

Invest in ESG funds. They vote in favor of corporate sustainability. You can do this yourself with proxy campaigns cross-referencing with NGO data, but the effort is overly burdensome. More importantly, companies know what the ESG funds are doing, and they have actual sway to be listened to. They don't have lower returns than the index funds you'd buy anyway (speculative, depends on your choices), it's a no-brainier.

Oh, and become filthy rich. That will help.