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She ignored that, and made him promise to remove the space minors. He did, meanwhile calculating the loss of light that would result, then trying to keep a wince off his face. Insolation would drop by about twenty percent, a very substantial amount indeed. “It will start an ice age,” he muttered.

“Good,” she said.

But she was not satisfied. And as she left the room, he could see by the set of her shoulders that his concession had done little if anything to comfort her. One could only hope her cohorts were more easily pleased. In any case it would have to be done. It might stop a civil war. Of course a great number of plants would die, mostly at the higher elevations, though it would affect every ecosystem to some extent. An ice age, no doubt about it. Unless they reacted very effectively. But it would be worth it, if it stopped the fighting.

It would have been easyto just cut the great band of the annular mirror and let it fly away into space, right out of the plane of the ecliptic. Same with the soletta: fire a few of its positioning rockets and it would spin away like a Catherine wheel.

But that would be a waste of processed aluminum silicate, which Sax did not like to see. He decided to investigate the possibility of using the mirrors’ directional rockets, and their reflectivity, to propel them elsewhere in the solar system. The soletta could be located in front of Venus, and its mirrors realigned so that the structure became a huge parasol, shading the hot planet and starting the process of freezing out its atmosphere; this was something that had been discussed in the literature for a long time, and no matter what the various plans for terraforming Venus included, this was the standard first step. Then having done that, the annular mirror would have to be placed in the corresponding polar orbit around Venus, as its reflected light helped to hold the soletta/parasol in its position against the push of solar radiation. So the two would still be put to use, and it would also be a gesture, another symbolic gesture, saying Look here — this big world might be terraformable too. It wouldn’t be easy, but it was possible. Thus some of the psychic pressure on Mars, “the only other possible Earth,” might be relieved. This was not logical, but it didn’t matter; history was strange, people were not rational systems, and in the peculiar symbolic logic of the limbic system, it would be a sign to the people on Earth, a portent, a scattering of psychic seed, a throwing together. Look there! Go there! And leave Mars alone.

So he talked it over with the Da Vinci space scientists, who had effectively taken over control of the mirrors. The lab rats, people called them behind their backs, and his (though he heard anyway); the lab rats, or the saxaclones. Serious young native Martian scientists, in fact, with just the same variations of temperament as grad students and postdocs in any lab anywhere, anytime; but the facts didn’t matter. They worked with him and so they were the saxaclones. Somehow he had become the very model of the modern Martian scientist; first as white-coated lab rat, then as full-blown mad scientist, with a crater-castle full of eager Igors, mad-eyed but measured in manner, little Mr. Spocks, the men as skinny and awkward as cranes on the ground, the women drab in their protective noncoloration, their neuter devotion to Science. Sax was very fond of them. He liked their devotion to science, it made sense to him — an urge to understand things, to be able to express them mathematically. It was a sensible desire. In fact it often seemed to him that if everyone were a physicist then they would be very much better off. “Ah, no, people like the idea of a flat universe because they find negatively curved space difficult to deal with.” Well, perhaps not. In any case the young natives at Da Vinci Crater were a powerful group, strange or not. At this point Da Vinci was in charge of a lot of the underground’s technological base, and with Spencer fully engaged there, their production capability was staggering. They had engineered the revolution, if the truth were told, and were now in de facto control of Martian orbital space.

This was one reason why many of them looked displeased or at least nonplussed when Sax first told them about the removal of the soletta and annular mirror. He did it in a screen meeting, and their faces squinched into expressions of alarm: Captain, it is not logical. But neither was civil war. And the one was better than the other.

“Won’t people object?” Aonia asked. “The greens?”

“No doubt,” Sax said. “But right now we exist in, in anarchy. The group in east Pavonis is a kind of proto-government, perhaps. But we in Da Vinci control Mars space. And no matter the objections, this might avert civil war.”

He explained as best he could. They got absorbed in the technical challenge, in the problem pure and simple, and quickly forgot their shock at the idea. In fact giving them a technical challenge of that sort was like giving a dog a bone. They went away gnawing at the tough parts of the problem, and just a few days later they were down to the smooth polished gleam of procedure. Mostly a matter of instructions to AIs, as usual. It was getting to the point where having conceived a clear idea of what one wanted to do, one could just say to an AI, “please do thus and such” — please spin the soletta and annular mirror into Venusian orbit, and adjust the slats of the soletta so that it becomes a parasol shielding the planet from all of its incoming insolation; and the AIs would calculate the trajectories and the rocket firings and the mirror angles necessary, and it would be done.

People were becoming too powerful, perhaps. Michel always went on about their godlike new powers, and Hiroko in her actions had implied that there should be no limit to what they tried with these new powers, ignoring all tradition. Sax himself had a healthy respect for tradition, as a kind of default survival behavior. But the techs in Da Vinci cared no more for tradition than Hiroko had. They were in an open moment in history, accountable to no one. And so they did it.

Then Sax went to Michel. “I’m worried about Ann.” They were in a corner of the big warehouse on east Pavonis, and the movement and clangor of the crowd created a kind of privacy. But after a look around Michel said, “Let’s go outside.”

They suited up and went out. East Pavonis was a maze of tents, warehouses, manufactories, pistes, parking lots, pipelines, holding tanks, holding yards; also junkyards and scrap heaps, their mechanical detritus scattered about like volcanic ejecta. But Michel led Sax westward through the mess, and they came quickly to the caldera rim, where the human clutter was put into a new and larger context, a logarithmic shift that left the pharaonic collection of artifacts suddenly looking like a patch of bacterial growth.

At the very edge of the rim, the blackish speckled basalt cracked down in several concentric ledges, each lower than the last. A set of staircases led down these terraces, and the lowest was railed. Michel led Sax down to this terrace, where they could look over the side into the caldera. Straight down for five kilometers. The caldera’s large diameter made it seem less deep than that; still it was an entire round country down there, far far below. And when Sax remembered how small the caldera was proportional to the volcano entire, Pavonis itself seemed to bulk under them like a conical continent, rearing right up out of the planet’s atmosphere into low space. Indeed the sky was only purple around the horizon, and blackish overhead, with the sun a hard gold coin in the west, casting clean slantwise shadows. They could see it all. The fines thrown up by the explosions were gone, everything returned to its normal telescopic clarity. Stone and sky and nothing more — except for the thread of buildings cast around the rim. Stone and sky and sun. Ann’s Mars. Except for the buildings. And on Ascraeus and Arsia and Elysium, and even on Olympus, the buildings would not be there.

“We could easily declare everything above about eight kilometers a primal wilderness zone,” Sax said. “Keep it like this forever.”

“Bacteria?” Michel asked. “Lichen?”

“Probably. But do they matter?”

“To Ann they do.”

“But why, Michel? Why is she like that?”