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Not at all. That is what World War III was about, and that spurred need and birth of my Mother. The Asian continent had banded together and struck first, destroying much of the rest of the world. The rest struck back quickly, destroying most of Asia as well. What few people that were left immigrated to the last few cities on Earth, one of them forming Michelangelo City, the mega-city that resides over the former wards of Tokyo.
However, it is only a matter of time until all of the humans die out. There are no animals, there are are very few plants, and human disease and mortality is very, very high. They cannot withstand radiation like me and my late siblings could.