I don’t really think that the author of this book believes the world will “end” this soon but anyways. This is a post apocalyptic dystopia that sets it’s scene in Moscow 2033: the book metro 2033
spoiler about the metro seriesIn the later books it kinda seems like that it’s only Russia that has been nuked out of existence so really the world hasn’t ended. But if you just read the first book you would not get to know that
The human species will not end, we are way to many people for that. Even if 99,9% of people die, the remaining 8 000 000 people are more then enough to allow for stable populations even if those 8 000 000 are spread all over the globe in smaller communities.
Even a nuclear war is highly unlikely to eradicate the human species as a whole, the sheer numbers of human beings makes us, as a species, extremely resilient against extinction.
That should not be understood as me saying that we can do whatever we want, not at all. On the contrary, we should do a lot to restore the damage we have done to the earth as fast as possible, or at least reduce the amount of damage we still do to zero if possible.