Happily, in this context, plants were pitifully few. Tempe was not like Tyrrhena, or even the banks of the Arena Glacier. Without active gardening, this was what one got. The world was still mostly rock.

On the other hand, Tempe was low in altitude, and humid, with the ice ocean just a few kilometers to the north and west. And various Johnny Appleseed flights had passed over the entire southern shoreline of the new sea— part of Biotique’s efforts, begun some decades ago, when Sax had been in Burroughs. So there was some lichen to be seen, if you looked hard. And small patches of fellfield. And a few krummholz trees, half-buried in snow. All these plants were in trouble in this northern summer-turned-winter, except for the lichen of course. There was a fair bit of miniaturized fall color already, there in the tiny leaves of the ground-hugging koenigia, and pygmy buttercup, and icegrass, and, yes, arctic saxifrage. The reddening leaves served as a kind of camouflage in the ambient redrock; often Sax didn’t see plants until he was about to step on them. And of course he didn’t want to draw Ann’s attention to them anyway, so when he did stumble on one, he gave it a quick evaluative glance and walked on.

They climbed a prominent knoll overlooking the canyon west of the refuge, and there it was: the great ice sea, all orange and brass in the late light. It filled the lowland in a great sweep and formed its own smooth horizon, from southwest to northeast. Mesas of the fretted terrain now stuck out of the ice like sea stacks or cliff-sided islands. In truth this part of Tempe was going to be one of the most dramatic coastlines on Mars, with the lower ends of some fossae filling to become long fjords or lochs. And one coastal crater was right at sea level, and had a break in its sea side, making it a perfect round bay some fifteen kilometers across, with an entry channel about two kilometers across. Farther south, the fretted terrain at the foot of the Great Escarpment would create a veritable Hebrides of an archipelago, many of the islands visible from the cliffs of the mainland. Yes, a dramatic coastline. As one could see already, looking at the broken sheets of sunset ice.

But of course this was not to be noted. No mention at all of the ice, the jagged bergs jumbled on the new shoreline. The bergs had been formed by some process Sax wasn’t aware of, though he was curious— but it could not be discussed. One could only stand in silence, as if having stumbled into a cemetery.

Embarrassed, Sax knelt to look at a specimen of Tibetan rhubarb he had almost stepped on. Little red leaves, in a floret from a central red bulb.

Ann was looking over his shoulder. “Is it dead?”

“No.” He pulled off a few dead leaves from the exterior of the floret, showed her the brighter ones beneath. “It’s hardening for the winter already. Fooled by the drop in light.” Then Sax went on, as if to himself: “A lot of the plants will die, though. The thermal overturn,” which was when air temperatures turned colder than the ground temperatures, “came more or less overnight. There won’t be much chance for hardening. Thus lots of winterkill. Plants are better at handling it than animals would have been. And insects are surprisingly good, considering they’re little containers of liquid. They have supercooling cryoprotectants. They can stand whatever happens, I think.”