1) Permanently limit human population to a small number
2) Change human attitudes such that they no longer pursue exponential growth.
Either one is tough to do. For my "one act" I suppose I would try to change the attitudes.
It might be possible to go back to Egypt and Amenhotep IV, and do various "magic" - say, a 10 megaton thermonuclear device on some other country's city - to persuade him that one was the emissary of Ra. Then introduce a set of beliefs. All would subscribe to those beliefs or they would be terminated.
Then innoculate the population. Call it receiving Ra's blessing.
Then release a bioengineered virus to eliminate the rest of the human race.
It could work. But I suspect the believers would stray from the fold.


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