I believe I first heard about this study on a Freakonomics podcast. It doesn't address the moral issues, of which there are arguments on both sides. But it's interesting.
Personally I would have a hard time with the decision to abort an unwanted pregnancy. But it'll never be my decision to make. The clearly more preferable situation would be to prevent unwanted pregnancies altogether, but in the real world real people face this decision. I more support their right to make the decision than I oppose it but it's troubling.
Note, I didn't post the actual study, but a discussion of it. If interested, you can find the actual study on your own pretty easily.
Link: https://www.prb.org/resources/new-study-claims-abortion-is-behind-decrease-in-crime/