But she drove northeast, downcanyon, until she was in the bed of the little unnamed channel at sixty degrees longitude, fifty-three degrees north. This valley had been carved by a small aquifer outbreak during the late Amazonian, running in an earlier graben fault, down the lower slopes of the Great Escarpment. The scoring effects of the flood were still visible on the rims of the canyon walls, and in the lenticular islands of bedrock on the floor of the channel.

Which now ran north into a sea of ice.

• • •

She got out of the car wearing a fiberfilled windsuit, a CO2 mask, goggles, and heated boots. The air was thin and cold, though it was spring now in the north— Ls 10, m-53. Cold and windy, ragged lines of low puffy clouds racing east. It was either going to be an ice age or, if the greens’ manipulations forestalled it, then a year-without-summer, like 1810 on Earth, when the explosion of the volcano Tambori had chilled the world.

TEMPE TERRA

She walked the shore of the new sea. It was at the foot of the Great Escarpment, in Tempe Terra, a lobe of ancient highlands extending into the north. Tempe had probably escaped the general stripping of the northern hemisphere by being roughly opposite the impact point of the Big Hit, which most areologists now agreed had struck near Hrad Vallis, above Elysium. So; battered hills, overlooking an ice-covered sea. The rock looked like a red sea’s surface in a wild cross chop; the ice looked like a prairie in the depths of winter. Native water, as Michel had said— there from the beginning, on the surface before. It was a hard thing to grasp. Her thoughts were scattered and confused, darting this way and that, all at the same time— it was like madness, but not. She knew the difference. The hum and keen of the wind did not speak to her in the tones of the MIT lecturer; she suffered no choking sensations when she tried to breathe. It was not like that. Rather her thinking was accelerated, fractured, unpredictable— like that flock of birds over the ice, zigzagging across the sky in a hard wind from the west. Ah the feel of that same wind against her body, shoving at it, the new thick air like a great animal paw. . . .