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Focussing on the history of chemical weapons, Peter Sloterdijk counts down the chronology of the twentieth century from 22 April 1915, when gas was first used on the battlefield.
The essay "Terror from the Air" (2001) develops the thesis that modern warfare is not fought between combatants but to destroy the life-world of the enemy, and that the combination of terrorism, industrial design and the opening up of the environment best characterises the twentieth century's contribution to human development.

The philosophical essay on the threat in the atmosphere touches on the history of Cyclone B gas, the bombing of Dresden, the dropping of nuclear bombs on Hiroshima and Nagasaki, the practices of surrealism, including Salvador Dalí's report in a spacesuit, and touches on Kazimir Malevich's Black Square and Marcel Duchamp's Air of Paris.