"Then, about six thousand years after we were invented, it became clear that the Earth was entering one of its periodic Ice Ages. Left to its own devices this would not have been much of a problem, but it was a nuisance both we and the humans felt we could avoid. We built enormous sun-mirrors and seeded the atmosphere with greenhouse gases, and easily reversed the temperature dip. In fact, we succeeded much too well. Within a hundred years it became obvious that we had overshot our goal. But our efforts to cool the planet were not as successful as our efforts to warm it. Both ice caps melted, the sea level rose sixty meters, and vast land areas became sea floor.

This was a different nuisance, but it was not the final catastrophe.

The Antarctic continent had been crushed for millions of years beneath its three kilometer thick shield of ice; like a ship relieved of a heavy cargo it now wanted to rise, its lighter rocks buoyed up by the denser material of the Earth's mantle. And that lifting did not occur evenly. Great fault lines opened up into ranges of volcanoes as long-trapped magma suddenly found paths to the surface. New mountain ranges added their weight to the strain on the ancient continental plate as Antarctica regained its equilibrium. All the while a dense soot cloud blanketed the Earth and the brief summer of warming darkened into a cruel permanent winter.

The ice caps returned, but the southern snow accumulation did not stop the volcanoes. Glaciers raced toward the Equator, and after they met the oceans began to freeze. Later the atmosphere's carbon dioxide began to collect as snow on the poles. We had long since given up on saving our creators and worked instead to record their accomplishments and understand their biology before they were gone."

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