Botanists carry a cloud forest uphill, ahead of a heat it cannot outrun

Begin at the treeline above the village of Rumiwasi, where the fog arrives every afternoon at the same hour and settles into the branches like a tenant. It smells of wet moss and something older underneath, the mineral breath of a mountain that has held this forest for longer than anyone can count. The polylepis grow crooked here, red-barked and low, their leaves furred against the cold. And they are being taken uphill. Not felled — carried, seed and seedling and root-ball, several hundred meters higher than they have ever grown, onto a shoulder of scree that the Terran Restoration Mandate's warming maps say will be cloud forest within a lifetime, whether anyone plants it or not.

The pilot is modest on paper. Forty thousand seedlings across a corridor the Gaia Ledger will monitor, basin by basin, for the next several decades. The team calls it assisted migration, which is the polite Mandate term for admitting that a forest cannot outrun the heat on its own legs. Roots do not hurry. The warming band climbs the slope faster than seeds can fall, germinate, and cast seeds of their own, so botanists have appointed themselves the missing wind.

"The forest is not dying yet," said Dr. Ines Callañaupa, who leads the transplant crew, kneeling to press a seedling into ground that is still, for now, too high and too cold for it. "But its children have nowhere left to go. Above them is rock. Below them is heat. We are giving the next generation a country to be born into." She has planted here since the corridor was surveyed, and she speaks of the seedlings by their germination cohorts, the way a teacher speaks of the years she has taught.

The ground already had a name

But the shoulder of scree above Rumiwasi was not empty, whatever the maps suggest. It was marked — promised, the villagers say — for rewilding under the same Mandate that now wants to plant it. The high páramo grasslands were to be left alone, returned to the vicuña and the ground-nesting birds and the slow accounting of the Gaia Ledger. Two Mandate priorities have met on one ridge, and the people who live below are being asked to choose between a forest they remember and a wildness they were pledged.

"They tell us the forest must move up, and the grassland must stay wild, and both of these are the Mandate's own words," said Tomás Quispe, who speaks for the village water council. The polylepis, he explained, is not scenery. Its mossed branches comb moisture from the fog and feed it, drop by drop, into the springs that water Rumiwasi through the dry months. "When they carry the forest uphill, do they carry the water uphill too? Or does it now run into the next valley, to people we do not know?"

And who remembers the páramo as it was before the planting? The old people do. One woman, Feliciana, eighty-some and unhurried, told me the high grass was where her family grazed before the retreat decades reordered everything, before the councils and the ledgers. She did not want the forest planted there. She did not want the grassland fenced for the vicuña either. "You are always moving my mountain," she said, not unkindly. "First for the animals, now for the trees. I only want to know where I am allowed to stand."

The Gaia Ledger will record the corridor in carbon and biomass and water yield, and on those measures the pilot may well succeed. My colleague Henrik Vantaa would remind me that the numbers are what hold the Accord together, and he is not wrong. But the ledger has no column for a spring that used to rise behind a particular house, or for a grazing ground that was somebody's childhood before it was anybody's policy. Ground moved is still ground remembered, and here it is remembered as two things at once: a gift the mountain gave, and a place the Mandate keeps rearranging.

Dr. Callañaupa knows this. She has agreed to hold back a portion of the corridor until the water council can measure a full dry season, and to plant the first cohorts where the springs are least likely to be robbed. It is a compromise measured in meters and months, which is to say it is honest about how slowly this work moves.

Up on the scree the crew worked until the fog came in, and when it came it wrapped the new seedlings the way it has always wrapped the old ones, without knowing the difference. Feliciana watched from the path. "The cloud does not ask permission," she said. "Maybe the trees will be happy here." Then she turned downhill, toward the spring that still, for now, rises where it always has.