“The planet is the lab,” Sax replied.

John laughed, moved a bright yellow surarctic cactus from a countertop and sat down. It was said Sax never left these rooms anymore. “What are you simming today?”

“Atmospheres.”

Of course. It was a problem that gave Sax a serious case of the blinks. All the heat they were releasing or applying to the planet was thickening the atmosphere, but all their CO2-fixing strategies were thinning it; and as the chemical composition of the air slowly shifted to something less poisonous it became less greenhouse-gassed as well, so that things cooled back down and the process slowed. Negative feedback countering positive feedback, all over the place. Juggling all these factors into any meaningful extrapolative program was more than anyone had yet accomplished to Sax’s satisfaction, so he had resorted to his usual solution; he was trying to do it himself.

He paced the narrow aisles left between equipment, moving chairs out of his way. “There’s just too much carbon dioxide. In the old days the modelers swept that under the rug. I think I’m going to have to have robots feed the southern polar cap into Sabatier factories. What we can process won’t sublime, and we can release the oxygen and make bricks of the carbon, I guess. We’ll have more carbon blocks than we’ll know what to do with. Black pyramids to go along with the white.”

“Pretty.”

“Uhn.” The Crays and the two new Schillers hummed away behind him, providing his monotonal recitative with a ground bass. These computers spent all their time running through one set of conditions after another, Sax said; but the results, while never the same, were seldom encouraging. The air was going to be cold and poisonous for a good while yet.

Sax wandered down the hall, and John followed him into what looked like another lab, although there was a bed and a refrigerator in one corner. Violently disarranged bookscapes were overgrown with potted plants, bizarre Pleistocene growths that looked as deadly as the air outside. John sat in the lone empty chair. Sax stood and looked down at a seashell shrub as John described his meeting with Ann.

“Do you think she’s involved?” Sax said.

“I think she may know who is. She mentioned someone called the coyote.”

“Ah yes.” Sax glanced briefly at John-at his feet, to be precise. “She’s siccing us onto a legendary character. He’s supposed to have been on the Ares with us, you know. Hidden by Hiroko.”

John was so surprised that Sax had heard of the coyote that it took him a while to figure out what else was disturbing about what he had said. But then it came to him. One night Maya had told him that she had seen a face, the face of a stranger. The voyage out had been hard on Maya, and he had discounted the tale. But now…

Sax was wandering around turning on lights, peering at screens, muttering about security measures. He opened the refrigerator door briefly and John caught a glimpse of more spiky growths; either he kept experiments in there, or else his snack food had suffered a truly virulent eruption of mold. John said, “You can see why most of the attacks have been on the moholes. They’re the easiest project to attack.”

Sax tilted his head to the side. “Are they?”

“Think about it. Your little windmills are everywhere, there’s nothing to be done about them.”

“People are disabling them. We’ve had reports.”

“What, a dozen? And how many are out there, a hundred thousand? They’re junk, Sax. Litter. Your worst idea.” And nearly fatal to his project, in fact, because of the algae dishes Sax had hidden in some of them. All of that algae had died, apparently; but if it hadn’t, and if anyone had been able to prove Sax had been responsible for its dissemination, he could have lost his job. It was yet another indication that Sax’s logical manner was a front.

Now his nose was wrinkled. “They add up to a terawatt a year.”

“And knocking a few apart won’t do anything to that. As for the other physical operations, the black snow algae is on the northern polar cap, and can’t be removed. The dawn and dusk mirrors are in orbit, and it’s not so easy to knock them out.”

“Someone did it to Pythagoras.”

“True, but we know who it was, and there’s a security team following her.”

“She may never lead them to anyone else. They may be able to afford to expend a person per act, I wouldn’t be surprised.”

“Yeah, but some simple changes in screening personnel would make it impossible for anyone to smuggle any tools aboard.”

“They could use what’s out there.” Sax shook his head. “The mirrors are vulnerable.”

“Okay. More than some projects, anyway.”

“Those mirrors adding thirty calories per square centimeter per sol,” Sax said. “And more all the time.” Almost all the freighters from Earth were sunsailers now, and when they arrived in the martian system they were linked to large collections of earlier arrivals parked in areosynchronous orbit, and programmed to swivel so that they reflected their light onto the terminators, adding a little bit of energy to each day’s dawn and dusk. The whole arrangement had been coordinated by Sax’s office, and he was proud of it.

“We’ll increase security for all the maintenance crews,” John said.

“So. Increased security on the mirrors and at the moholes.”

“Yes. But that’s not all.”

Sax sniffed. “What do you mean?”

“Well, the problem is that it isn’t just the terraforming projects per se that are potential targets. I mean, the nuclear reactors are part of the project too in their way; they provide a lot of your power, and they’re pumping out heat like the furnaces they are. If one of them were to go, it would cause all kinds of fallout, more political even than phyical.”

The vertical lines between Sax’s eyes reached up nearly to his hairline. John held out his palms. “Not my fault. That’s just the way it is.”

Sax said, “A.l., take a note. Look into reactor security.”

“Note taken,” one of the Schillers said, sounding just like Sax.

“And that’s not the worst,” John said. Sax twitched, glared furiously at the floor. “The bioengineering labs.”

Sax’s mouth became a tight line.

“New organisms are being cooked up daily,” John went on, “and it might be possible to create something that would kill everything else on the planet.”

Sax blinked. “Let’s hope none of these people think like you.”

“I’m just trying to think like them.”

“A. I., take a note. Biolab security.”

“Of course Vlad and Ursula and their group have stuck suicide genes into everything they’ve made,” John said. “But those are meant to stop oversuccess, or mutational accidents. If someone were to deliberately circumvent them, and concoct something that fed on oversuccess, we could be in trouble.”

“I see that.”

“So. The labs, the reactors, the moholes, the mirrors. It could be worse.”

Sax rolled his eyes. “I’m glad you think so. I’ll talk to Helmut about it. I’ll be seeing him soon anyway. It looks like they’re going to approve Phyllis’s elevator at the next UNOMA session. That will cut the costs of terraforming tremendously.”

“Eventually it will, but the initial investment must be huge.”

Sax shrugged. “Push an Amor asteroid into orbit, set up a robot factory, let it go to work. It’s not as expensive as you might think.”

John rolled his eyes. “Sax, who’s paying for all this?”

Sax tilted his head, blinked. “The sun.”

John stood, suddenly hungry. “Then the sun calls the shots. Remember that.”

Mangalavid broadcastsix hours of local amateur video every evening, a weird grab bag of stuff that John watched every chance he got. So after building a big green salad in the kitchen he went to the window room on the dorm floor, and watched while eating, glancing from time to time at the florid sunset over Ascraeus. The first ten minutes of that evening’s broadcast had been shot by a sanitary engineer working on a waste processing plant in Chasma Borealis; her voiceover was enthusiastic but boring, “What’s nice is we can pollute all we want with certain materials, oxygen, ozone, nitrogen, argon, steam, some biota-which gives us leeway we didn’t have back home, we just keep grinding what they give us till we can let it loose.” Back home, John said to himself. A newcomer. After her there was an attempt at a karate bout, both hilarious and beautiful at the same time; and then twenty minutes of some Russians staging Hamlet in pressure suits at the bottom of the Tyrrhena Patera mohole, a production that struck John as crazy until Hamlet caught sight of Claudius kneeling to pray, and the camera tilted up to show the mohole as cathedral walls, rising above Claudius to an infinitely distant shaft of sunlight, like the forgiveness he would never receive.