During the next thirty years the pole-ward migration of populations continued. A few fortified cities defied the rising water-levels and the encroaching jungles, building elaborate sea-walls around their perimeters, but one by one these were breached. Only within the former Arctic and Antarctic Circles was life tolerable. The oblique incidence of the sun’s rays provided a shield against the more powerful radiation. Cities on higher ground in mountainous areas nearer the Equator had been abandoned, despite their cooler temperatures, because of the diminished atmospheric protection

J. G. Ballard
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