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In North Africa the pattern is now disrupted by many big shallow lakes dotting the Sahara and the Sahel. The water has been pumped out of the Mediterranean and deposited in depressions in the desert, often in ancient lake beds. Some of these are as big as the Great Lakes, though much shallower. They’re freshwater lakes; the water from the Med has been progressively desalinated on its way inland, and the recovered salts have been bonded with fixatives to make excellent white bricks and roof tiles. White roof tiles covered by translucent photovoltaic film have been used for all new construction since the Accelerando, and retrofitted onto many older roofs as well; these days when seen from space, cities look like patches of snow.

But clean tech came too late to save Earth from the catastrophes of the early Anthropocene. It was one of the ironies of their time that they could radically change the surfaces of the other planets, but not Earth. The methods they employed in space were almost all too crude and violent. Only with the utmost caution could they tinker with anything on Earth, because everything there was so tightly balanced and interwoven. Anything done for good somewhere usually caused ill somewhere else.

This caution about terraforming Earth expressed itself in clots and gouts of sometimes military bickering. Political crosschop led to legal gridlock. Big geoengineering projects were all assumed to contain within them an accident like the Little Ice Age of the 2140s, which was generally said to have caused the death of a billion people. Nothing now could overcome that fear.

Also, for many of Earth’s problems, there was simply nothing to be done. The heating and subsequent expansion of the ocean’s water-also its acidification-nothing could be done about these. There was no terraforming technique that would help. Some water had been pumped onto the dry basins of North Africa and central Asia, but the capacity was not there to hold very much of the ocean’s excess volume. Maintaining the one healthy ice cap remaining to them, high on East Antarctica, was a priority that meant no one was comfortable pumping salt water up there to freeze, as had sometimes been proposed, because if something went wrong and they lost the whole ice cap, it would raise sea level another fifty meters and deal humanity something very like a death blow. So caution was in order, and ultimately it had to be admitted: the new sea level could not be substantially altered. And it was much the same with many of their other problems. The many delicate physical, biological, and legal situations were so tightly knitted together that none of the cosmic engineering they were doing elsewhere in the solar system could be fitted to the needs of the place.

Despite this, people tried things. So much more power than ever before was at their command that some felt they could at last begin to overturn Jevons Paradox, which states that the better human technology gets, the more harm we do with it. That painful paradox has never yet failed to manifest itself in human history, but perhaps now was the tipping point-Archimedes’ lever brought to bear at last-the moment when they could get something out of their growing powers besides redoubled destruction.

But no one could be sure. They still hung suspended between catastrophe and paradise, spinning bluely in space like some terrible telenovela. Scheherazade was Earth’s muse, it seemed; it was just one damn thing after another, always one more cliffhanger, clinging to life and sanity by the skin of one’s teeth; and so the spacers kept on coming home, home to home’s nightmares, with the Gordian knot tied right in their guts.

SWAN ON EARTH

Earth exerted a fatal attraction far beyond its heavy g, having to do more with its nearly infinite historical gravity, its splendor and decadence and dirt. You didn’t have to go to Uttar Pradesh and view the melting ruins of Agra or Benares to see it-it was fractal and everywhere, in every valley and village: decrepit age, the stink of cruel societies, bare eroded hillsides, drowned coastlines still melting into the sea. A very disturbing place. The strangeness was not always obvious or tangible. Human time here was simply wrenched; the center had not held; things fell apart and recombined to create feelings that did not cohere inside one. Ideas of order became hopelessly bogged in ancient stories, webs of law, faces on the street.