Polar cities are proposed sustainable polar retreats designed to house human beings in the future, in the event that global warming causesthe central and middle regions of the Earth to become uninhabitablefor a long period of time. Although they have not been built yet, some futurists have been giving considerable thought to the concepts involved.High-population-density cities, to be built near the Arctic Rim with sustainable energy and transportation infrastructure, will requiresubstantial 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 andmycorrhizal fungi can likely remedy such poverty without the need forpetroleum-derived fertilizers. Regional probiotic soil improvementshould perhaps rank high on any polar cities priority list. James Lovelock's notion of a widely distributed almanac of science knowledge and post-industrial survival skills also appears to have value.
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