The Ark in Space is a work of political philosophy, set in the context of man's exploitation of planet Earth to fulfil his various needs. The work offers a hypothesis - that planet Earth has a finite capacity to sustain man's manipulation of his environment as he seeks to consume ever more and thus wield the natural assets of the planet to this end. The hypothesis suggests that the over exploitation of planet Earth's productive capacity in some way contributes to malignant Climate Change. The work suggests that political consequences stem from the hypothesis of planet Earth's finite productive capacity. These entail revisiting and reappraising the ideals of liberty, equality and fraternity. The hypothesis in order to resonate employs a metaphor designed to encapsulate the suggested finite ability of planet Earth to accommodate the ever increasing demands that man places upon it to facilitate his consumerist tendency. The metaphor envisages Earth as an Ark in Space. It is designed to condense our thinking about the ability of the planet to sustain man's manipulation of it to suit his acquisitive inclination. Planet Earth, the Ark in Space is the common good which must be sustained through combined and concerted fraternal action, driven by a philosophy of conservation as opposed to consumption. This edition of The Ark in Space has been fully revised for 2013.