I'd say the huge moral innovation of the 20th century is scientifically showing the human fetus is neither human, alive, nor a person. In a previous era, society frowned on abortion and contraception due to the old fashioned Judeo-Christian moral views, and so we had over population and widespread violence and poverty. But, thanks to the moral innovation of fetal science, we've discovered that we can stop violence before it happens by eliminating fetuses instead. So, instead of millions of dead humans, we have millions of terminated fetuses. The great gift of 20th century science is an ability to define the problem away, in a sense. And today we are almost at the point where we can completely discard of morality altogether, which will bring about a true utopia on earth because then nothing will be wrong.