In the late 21st Century, a series of sudden violent and prolonged solar storms lasting several years enlarged the Van Allen belts and diminished the Earth's gravitational hold upon the outer layers of the ionosphere. Solar radiation bombarded the planet, causing temperatures to rise and a global tropical climate to form. The polar ice caps melted, causing sea levels to rise. With most of the planet no longer habitable for humans, the survivors migrated to the newly-hospitable poles.
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