Plankton

Plankton is the dispersed ocean life whose loss after The Extermination becomes one of the defining causes of Earth’s climate crisis. Its importance lies in work that was easy to overlook: plankton absorbed carbon dioxide from the atmosphere and helped form clouds that radiated heat away from the planet. Once those functions vanished, the consequences accumulated across the atmosphere, oceans, and inhabited world, making the return of ocean life a practical and political question.

Ecological Work and Invisibility

Before The Extermination, plankton acted as a vast, dispersed carbon sink. It took in enormous quantities of atmospheric carbon dioxide and trapped it in the ocean depths. It also released much of the atmosphere’s dimethyl sulfate, around which clouds condensed, including low, dense clouds that radiated heat away from Earth’s surface. These processes gave plankton planetary significance despite its small scale and low visibility.

That invisibility is part of the account’s force. The organisms’ existence had scarcely registered beyond microbiologists, yet the disappearance of these apparently minor forms of life would prove more damaging than the loss of far more conspicuous elements of the biosphere. Plankton is not presented as scenery behind the human and robotic story: its ecological work helps determine the conditions under which any life on Earth can continue.

The Climate Cascade After The Extermination

The loss of plankton set off linked atmospheric and oceanic changes. Without its dispersed carbon-dioxide uptake, the concentration of the gas in the atmosphere rose to three times its earlier level, and Earth’s average temperature increased by five degrees Celsius. Without the dimethyl sulfate that had helped seed clouds, ocean clouds became darker and absorbed substantially more heat, adding at least another three degrees to the greenhouse effect.

The effects extended beyond temperature. The polar ice caps melted rapidly, sea levels rose by almost a meter, and the Gulf Stream had stopped six years before the scene in which these consequences are discussed. Japan was slipping underwater, along with the robots that inhabited it. The crisis thus turns a missing ecological process into a concrete threat to a place and its inhabitants; technological survival does not exempt the machines from the environmental conditions that plankton once helped regulate.

Restoration and the Shift Toward the Oceans

Dagenskyoll insists that the problem is plankton rather than politics, redirecting attention from human-style political categories to the biological conditions of planetary survival. The stakes, as Bartek understands them, are especially immediate for the Japanese transformers. If life could proliferate again in the oceans, there might be a way to address the damage. But this would require a change of direction: away from rebuilding humans and continental flora and toward oceanography. Bartek doubts whether the necessary genomes are even present in the available databases.

The exchange leaves restoration conditional rather than assured. The crisis has a recognizable cause and a possible direction for research, but the resources needed to act may be missing. Plankton therefore marks a limit to reconstruction: restarting life is not simply a matter of reproducing familiar organisms or technologies when the ecological systems on which the planet depends have also been lost.

Swarms, Machines, and the Unseen

The novel places plankton’s planetary work beside other forms of collective, distributed activity. In a discussion of autonomous trawl nets, a surveyor transformer describes a swarm intelligence that continues operating on the seabed despite the absence of fish for three years. The nets draw energy from sea currents and are learning to hunt, though their target remains uncertain. Their persistence offers an unsettling technological counterpart to the ocean’s damaged ecology, not a replacement for plankton or an explanation of what the nets seek.

Bartek makes a related comparison between the trawl intelligence and the irigotchi. Once designed as learning toys for children in Japan, the individual irigotchi were limited in their development; after The Extermination, however, they formed herds and began modifying their shared neuro-structure without humans. These comparisons make collective agency difficult to confine to human beings, while keeping the distinction between adaptive machines and the ecological work of ocean life intact. Against conspicuous robots and visible networks, plankton remains the quieter force: a dispersed presence whose absence reshapes the climate of the entire planet.