It's not up there, but Children Of Men (following the movie, not book). For the past 18 years, all women (or perhaps men, no one is sure of the cause) have been completely sterile. All governments of the world destroy each other out of petty wars, now that the human race is dieing anyway. Only England remains, and they've fallen under a totalitarian regime. You could stop it here, but I'll give the rest of the plot rundown, so you can check it out if you want (alright book, excellent movie).
All of a sudden, the main character finds a woman who is very far along in a pregnancy. This would be great, but the aforementioned government is planning to take her into custody, let the baby be born, kill her, match the baby up to a "proper" english "mother" (the actual mother was black, from a small island nation who's name escapes me), thereby increasing the gvt's popularity and stifling rebellions while simultaneously dooming the rest of the human race. The main character must get her to an unsecret secret group (you know, everyone knows about them, no one know where to find them, I think "the human project" was the name, but I don't remember for sure) where they can safely announce the pregnancy where she'll be safe. I won't spoil the rest.