"Ethical investment" funds often provide good returns, but there is a catch.

"Ethical" companies are typically judged based on mainstream ideas of what is, and what isn't, ethical. Around 20 years ago I invstigated an ethical investment fund and found that its principal stock holding was Microsoft. And that made sense. Microsoft treated its employees well, and did not produce physical pollution. Microsoft must have seemed quite ethical, if one disregarded the injustice of nonfree software, and the issue of having a near-monopoly.