I mean the kind where we swap genes. A lower birthrate doesn't help much. Genetic engineering exists, but we can't change how our bodies have already developed

I mean the kind where we swap genes. A lower birthrate doesn't help much. Genetic engineering exists, but we can't change how our bodies have already developed quite so easily. I think occasional increases in brain plasticity may be more useful to change society itself (assuming you can get people to do something that alters their brains). That may not be necessary of course.