On the other hand, a lot of snow had already fallen in the south, and Sax had gained a great respect for snow’s ability to protect living things from cold and wind. The subnivean environment was quite stable. It could be that a drop in light, and subsequently in surface temperature, would not do that much harm to snowed-over plants, already shut down by their winter hardening. It was hard to say. He wanted to get into the field and see for himself. Of course it would be months or perhaps years before any difference would be quantifiable. Except in the weather itself, perhaps. And weather could be tracked merely by watching the meteorological data, which he was already doing, spending many hours in front of satellite pictures and weather maps, watching for signs. It made for a useful diversion when people came by to remonstrate with him for removing the mirrors, an event so common in the week following the event that it became tiresome.

Unfortunately weather on Mars was so variable that it was difficult to tell if the removal of the big mirrors was affecting it or not. A very sad admission of the state of their understanding of the atmosphere, in Sax’s opinion. But there it was. Martian weather was a violent semichaotic system. In some ways it resembled Earth’s, not surprising given that it was a matter of air and water moving around the surface of a spinning sphere: Coriolis forces were the same everywhere, and so here as on Earth there were tropical easterlies, temperate westerlies, polar easterlies, jet-stream anchor points and so on; but that was almost all one could say for sure about Martian weather. Well— you could say that it was colder and drier in the south than in the north. That there were rain shadows downwind of high volcanoes or mountain chains. That it was warmer near the equator, colder at the poles. But this sort of obvious generalization was all that they could assert with confidence, except for some local patterns, although most of those were subject to lots of variation— more a matter of highly analyzed statistics than lived experience. And with only fifty-two m-years on record, with the atmosphere thickening radically all the while, with water being pumped onto the surface, etc., etc., it was actually fairly difficult to say what normal or average conditions might be.

Meanwhile, Sax found it hard to concentrate there on east Pavonis. People kept interrupting him to complain about the mirrors, and the volatile political situation lurched along in storms as unpredictable as the weather’s. Already it was clear that removing the mirrors had not placated all the Reds; there were sabotages of terraforming projects almost every day, and sometimes violent fights in defense of these projects. And reports from Earth, which Sax forced himself to watch for an hour a day, made it clear that some forces there were trying to keep things the way they had been before the flood, in sharp conflict with other groups trying to take advantage of the flood in the same way the Martian revolutionaries had, using it as a break point in history and a springboard to some new order, some fresh start. But the metanationals were not going to give up easily, and on Earth they were entrenched, the order of the day; they were in command of vast resources, and no mere seven-meter rise in sea level was going to push them off stage.