The Terraforming is the comprehensive project to fundamentally transform Earth's cities, technologies, and ecosystems to ensure that the planet will be capable of supporting Earth-like life. Artificiality, astronomy, and automation form the basis of that alternative planetarity. This short book was written in July 2019. It is is an opening brief and manifesto for The Terraforming urban design research programme at the Strelka Institute in Moscow. It is a narrowly targeted polemic against dominant modes of planetarity and a rejoinder to inadequacies seen in how critical philosophy and design seeks to confront them. The title refers both to the terraforming that has taken place in recent centuries in the form of urbanisation, and to the terraforming that must now be planned and conducted as the planetary design initiative of the next centuries if true catastrophes are to be prevented. The term 'terraforming' usually refers to transforming the ecosystems of other planets or moons to make