The Planet Remade

Before proposing that we engineer the climate, Morton makes a disarming point: we already do. Not on purpose, but massively. Every year, human activity moves more nitrogen through the biosphere than all natural processes combined, mostly through the fertilizer that keeps agriculture running. We have altered the carbon cycle, the water cycle, the chemistry of the oceans. The idea of a pristine, untouched planet that geoengineering would violate is, on inspection, a fantasy. The touching has been going on for a century.

This reframing matters, because much of the horror geoengineering provokes rests on the sense that we would be crossing a line from a natural world into an artificial one. Morton argues the line was crossed long ago, distractedly, without anyone deciding. Burning fossil fuels is a planetary intervention — one with warming as its side effect. The difference between that and geoengineering is not that one touches the Earth and the other doesn't. It's that one is accidental and the other would be deliberate. And deliberate, he suggests, is not obviously worse.

Geoengineering is not one thing, and Morton is at pains to separate its very different branches. The first family aims at the sunlight — solar radiation management. The stratospheric veil belongs here, and so does a stranger cousin: brightening marine clouds by spraying fine seawater into the air from fleets of unmanned vessels, thickening the low clouds over the oceans so they reflect more light. These methods are cheap and fast-acting. That is precisely what makes them dangerous. Anything a single country, or a wealthy individual, could afford to do to the whole sky is a geopolitical problem as much as a scientific one.

The second family goes after the carbon itself — pulling CO2 back out of the air. This is what most of us instinctively prefer, because it addresses the cause rather than the symptom. Morton examines the biological routes, including fertilizing patches of ocean with iron to trigger blooms of photosynthetic plankton that draw down carbon as they grow and, ideally, sink it to the deep. The appeal is obvious; the record is humbling. Ocean experiments have been ambiguous, the carbon often returns, and the ecological side effects are poorly understood. Carbon removal is slow, expensive, and enormous in the scale it would need to matter.

Step back from the machinery and the book's larger claim comes into focus. Morton's real subject is not sulfur particles or plankton blooms; it is the end of a certain innocence. For most of human history we could imagine ourselves as inhabitants of a world that was simply given — a nature we lived within, sometimes damaged, but never authored. That world, he argues, is gone. Whether we intervene deliberately or not, the climate of the coming centuries will be a product of human choices. The atmosphere is now something we manage, badly, by default.

Once that sinks in, the moral terrain shifts. The question is no longer whether to keep the planet natural — that ship has sailed — but whether to keep engineering it carelessly, through the accumulated exhaust of our economies, or to start engineering it on purpose, with intention and accountability. Framed that way, refusing even to study geoengineering is not a neutral or humble position. It is a decision to let the accidental intervention run unchecked. Purity of intention, Morton suggests, is not the same as responsibility.

So the aircraft over the tropics, releasing their fine sulfuric mist, remain hypothetical — and Morton would say that's exactly the state they should be in for now: studied, understood, argued over, not deployed in haste or dismissed in horror. His book asks us to do something genuinely hard, which is to keep a frightening option on the table without either grabbing it or throwing it away. Between the fantasy of a technical fix and the comfort of refusal, there is a narrower, more honest path, and it runs straight through our discomfort.