A polar city is a proposed sustainable polar retreat designed to house human beings in the future, in the event that global warming causes the equatorial and middle latitudes of the Earth to become uninhabitable for a long period of time. Although they have not been built yet, some futurists have been given considerable thought to the concepts involved. High-population-density cities, Arctic Rim and Antarctica , New Zealand , Tasmania , and Patagonia, with sustainable energy and transportation infrastructure, will require substantial nearby agriculture. Boreal soils are largely poor in key nutrients like nitrogen and phosphorus, but nitrogen-fixing plants (such as the various alders ) with the proper symbiotic microbes and mycorrhizal fungi can be expected to be such a remedy for petroleum-derived fertilizers. Regional probiotic soil improvement. James Lovelock’s notion of a distributed almanac of science knowledge and post-industrial survival skills also appears to have value.
The polar cities climate retreat living pod concept is a worst-case scenario prediction  based on the ideas of British chemist and inventor James Lovelock : life in polar cities arrayed inland and around the shores of an ice-free Arctic Ocean in a greenhouse-warmed world. Dr. Lovelock, who in 1972 conceived of the Earth’s crust, climate, and veneer of life as a unified self-sustaining entity,  foresees humanity in full pole-bound retreat within the tropics roast – a scenario far outside the worst-case projections of climate scientists.
After reading a newspaper column  in which Dr. Lovelock predicted disastrous warming, Danny Bloom, a freelance newspaper reporter and climate blogger, teamed up with Deng Cheng-hong, a Taiwanese artist, and set up websites showing designs for self -sufficient Arctic communities.  Mr. Bloom’s intent is to conduct a non-threatening thought experiment that might be able to make a difference.
In 2012, two books about polar cities were published. Polar City Red , by Jim Laughter, is a climate fiction novel about life in a polar city in the year 2075 in Alaska. Polar City Dreaming: How To Change Climate Might Usher In The Age Of Polar Cities, by Stephan Malone, is a nonfiction history of polar city ideas.
The design of polar cities climate retreat living pods is currently (2008) driven by the Polar City Project. Danny Bloom is currently leading this effort. The defining characteristics are design efficiency, both, for operational costs as well as costs of construction, and a desire for the city to be a Zero energy building . The proposed agricultural module, for example, is a Sustainable agriculture vertical farm. 
- Jump up^ “We should plan for the worst-case climate scenario” Ken Caldeira, Bulletin of the Atomic Scientists 29 July 2008
- Jump up^ “” Polar Cities “is an idea whose time I hope never comes”
- Jump up^ Gaia hypothesis
- Jump up^ “James Lovelock: The Earth is about to catch a fever that can last as long as 100,000 years”, The Independent 16 January 2006
- Jump up^ “Global Warming and Polar Cities”
- Jump up^ “The Vertical Farm Project”