Present-day life is polluted at the roots. Man has put himself in the place of trees and animals and has polluted the air, has blocked free space. Worse can happen. The sad and active animal could discover other forces and press them into his service. There is a threat of this kind in the air. It will be followed by a great gain...in the number of humans. Every square meter will be occupied by a man. Who will cure us of the lack of air and of space? Merely thinking of it, I am suffocated!
....Perhaps, through an unheard-of catastrophe produced by devices, we will return to health. When poison gases no longer suffice, an ordinary man, in the secrecy of a room in this world, will invent an incomparable explosive, compared to which the explosives currently in existence will be considered harmless toys. And another man, also ordinary, but a bit sicker than others, will steal this explosive and will climb up at the center of the earth, to set it on the spot where it can have the maximum effect. There will be an enormous explosion that no one will hear, and the earth, once again a nebula, will wander through the heavens, freed of parasites and sickness.
--The final words of The Conscience of Zeno (pub. 1923), by Italo Svevo (pseudonym of Ettore Schmitz) (1861-1928), translated by William Weaver