This song used to scare the crap out of me when I was a kid. Test tube babies! Withered limbs! Judgement Day! It was nothing like the future I saw on Thunderbirds.
I picked up an old Zager & Evans album on vinyl a few years ago just for this track but my God the rest of it was rubbish, a horrible Folky-Psychedelic stew with social commentary lyrics that would embarrass your average pretentious Sixth Former. This is still a great record though, silly though it might be.