2430 A.D.
2430 A.D. is a science fiction short story by Isaac Asimov. It first appeared in the October 1970 issue of Think, the IBM house magazine, and was reprinted in Asimov's 1975 collection Buy Jupiter and Other Stories.
Early in 1970 the author was commissioned by Think to write a story based on a quotation by writer and social commentator J. B. Priestley:
Asimov, assuming that Think wanted a story that illustrated Priestley's quotation, crafted 2430 A.D. He selected the date because he calculated that at the then-current rate of human population growth, doubling every thirty-five years, that would be the year when the world's animal biomass would consist entirely of human beings. Asimov wrote the story on April 26, 1970 but it was rejected as Think had actually wanted a story that refuted the quotation. ("Well, they never said so," Asimov remarked later.) After Asimov wrote a second story that did refute the quotation, Think took the first story after all and published it in their October 1970 issue. The second story was later published in Analog magazine as The Greatest Asset. Both stories inspired by the Priestley quote were included in the 1975 collection Buy Jupiter and Other Stories.