This part is not in dispute and never was. Pollen cores and paleoecology confirm that Rapa Nui lost its forest and that the endemic palm disappeared. Everything that follows is an argument about what that meant, not whether it happened.

Carl Lipo and Terry Hunt have spent years building a case, synthesized in 2025, that the Polynesian rat did a great deal of the work. Rats arrived with the settlers (nobody is sure whether as stowaways or as provisions), they live in trees, and they eat palm nuts. Lipo's phrase is "rat candy." The oldest deposits at Anakena hold hundreds of rat bones per square meter, and preserved palm nuts are chewed through to the seed.

A palm that takes 70 years to fruit, a rat population with no predators eating the seeds, and people clearing plots for food. The forest had no path back. Framing that as a civilization too foolish to notice its last tree requires ignoring most of the mechanism.

The opposite, more or less. The Rapanui responded to thin soil and unreliable rain by engineering their way through it. They practiced lithic mulching, working stones into the soil so that phosphorus and potassium leached out, erosion slowed, and evaporation dropped. Mara Mulrooney and colleagues measured the result: rock garden soils carry more nutrients than the soil around them. Stone walled enclosures called manavai sheltered crops from the wind.

Annette Kühlem's team excavated Ava Ranga Uka a Toroke Hau between 2008 and 2024 and found dams, basins and underground aqueducts moving water from the Terevaka crater toward the southern coast. She calls it advanced hydraulic engineering. A prolonged drought starting around 1550 is exactly the sort of thing such a system exists for. They also found a planting pit cut into bedrock, filled with garden soil, holding a palm, next to an ahu. These people were planting trees, not just felling them.

Kühlem puts it plainly. The ecocide hypothesis is "a story of people being too stupid to realize what they were doing." The sites show mindful planning under bad conditions.

Statues left at the quarry or abandoned on roads lean noticeably forward, which is a strange design choice until you try to move one. Lipo and Hunt walked a 4.35 ton replica 100 meters in 40 minutes using ropes and 18 people, roughly the way you shuffle a refrigerator across a kitchen. The upright base was carved later, at the destination. "The statues were carved to move," Lipo says. Around 600 of them made it out of the quarry.

The timber budget. If the statues walked, the rollers and sledges that made statue building look like an act of ecological self harm were never needed. That said, the 2025 paper is subtitled as a response to critics, which tells you the transport question is argued rather than closed.

J. Víctor Moreno-Mayar and colleagues sequenced ancient DNA from 15 individuals held in Paris, radiocarbon dated between 1670 and 1950, and published in Nature in 2024. A crash severe enough to define the island's history should leave a scar in genetic diversity. There is no scar. Their models show slow growth over centuries and a population that never got very large.

The 2024 satellite and machine learning survey of the rock gardens points the same direction: far less cultivated land than earlier estimates, enough for a few thousand people, not the tens of thousands the collapse math requires.

As for the violence, Moreno-Mayar notes there is no archaeological evidence of fortification, which is conspicuous on an island whose people were demonstrably very good at stonework. No mass graves. No pile of skull fractures or blade marks. Not much weaponry. Nobody claims Rapa Nui was uniquely peaceful (Kühlem doubts it was), but intertribal conflict is not the same thing as societal breakdown.

Cannibalism, which was the detail everyone remembered, rests on the thinnest evidence of anything in the chain.

Jacob Roggeveen's fleet sighted the island on Easter Sunday, 1722, and his sailors shot 10 to 12 Rapanui within days of landing. His journal describes good soil, decent weather and cultivated food. Cook arrived 52 years later and found an island with almost nothing to offer and few people on it.

Then it got worse. Smallpox and tuberculosis. Peruvian blackbirding raids in 1862 and 1863 that carried off, as Kühlem notes, precisely the people who went out to greet visitors, meaning the knowledge holders. Chilean annexation in 1888, then a sheep ranching lease that ran until 1953 and confined the Rapanui to Hanga Roa, which they could leave only with a permission slip. "The island was totally scoured by sheep."

That is the landscape twentieth century archaeologists walked into and read as evidence of indigenous self destruction.