Which brings us to today. We find ourselves sandwiched between great ice ages, in a brief interglacial of warmth for a few thousand tenuous years, like the dozens of warm respites that have come and gone before. We should not expect this pleasant vacation to last much longer than it already has. In a geological moment, we should expect to be cast back into a great glacial age, during which New York City will look like the edge of Antarctica, with the Empire State Building an insignificant speck beside the icy face of the continental ice sheets. If the ice age returns, the seas will plummet 400
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