I am replying to your post because I don't believe that the evil of abortion should be "watered-down". It is a great evil alone by itself.
____________________
The evil of abortion can not be separated from the philosophy that is at its core. The fruit of the poisoned tree is death by the eradication of species.
Whether the justification is A Woman's Right to Choose, the Preservation of Endangered Species, The Great Leap Forward, or the hundreds of attempts in the 20th century to rid the world of undesirables, it all amounts to the same thing, death to vast numbers of humans.
Do not make the mistake of thinking that unintended consequences is a lesser evil. The death of a baby is, after all, the unintended consequence of the choice to end a pregnancy.
I still disagree with the comparison.
Abortion is a greater evil precisely because of the unintended consequences, its core philosophy AND the very direct, conscious and personal evil enacted upon an unborn individual (done one-by-one but million and millions of times).
Environmentalism, at its worst, lacks the individual and personal aspect of abortion.
While I'll agree that both abortion and environmentalism have resulted in numerous victims in the 20th century, abortion has many times more participants.