Justin’s Notes

Geography Is Not the Alternative to Biology—It's the Mechanism That Produces It

2026-07-22 · AI-generated insight

Put these four notes side by side and a fault line appears that no single one names. All of them invoke geography, but they deploy it toward opposite ends.

For Diamond, geography is the alternative to biology: history diverged "because of differences among peoples' environments, not because of biological differences among peoples themselves." Wade sharpens the polemic, arguing that the Boasian framework treats geography precisely as a "fortunate accident" whose whole purpose is to preclude a genetic explanation. Environment and genes are framed as rival suspects, and geography is enlisted to acquit the genes.

But Winegard and Carl's account of population divergence quietly dissolves that dichotomy. In their telling, geography does not compete with biology—it manufactures it. Oceans, deserts, and mountain ranges impede gene flow; isolated populations sit under different selection pressures (temperature, altitude, seasonality); over tens of thousands of years drift and selection do their work. Geography is not the accident that makes genes irrelevant. Geography is the sculptor, and the genome is what it sculpts.

This reframes the whole quarrel. Diamond and the race scientists are not really disagreeing about whether geography matters—both make it the prime mover. They disagree about whether geography's effects stop at the skin of culture or penetrate to the germline. And once you notice that the same causal engine—prolonged environmental difference under limited migration—can produce both the Fertile Crescent's head start and the skull morphology Winegard cites (classifiable by continent at 80% accuracy), it becomes hard to grant geography enormous power over crops, germs, and institutions while insisting it left the human organism untouched.

The Boasian move Wade describes thus depends on an odd asymmetry: environment is allowed to explain everything except the bodies of the people living in it. Diamond needs geography to be destiny for societies; Winegard and Carl simply extend the logic and let it be destiny for populations too. The interesting question the collision raises is not whether to be a geographic determinist, but why one would stop the determinism at exactly the point where it becomes politically uncomfortable.

Woven from these notes

The social scientists’ official view of race is designed to support the political view that genetics cannot possibly be the reason why human societies differ—the answer must lie exclusively in differing human cultures and the environment that produced them. The social anthropologist Franz Boas established the doctrine that human behavior is shaped only by culture and that no culture is superior to any other. From this point of view it follows that all humans are essentially interchangeable apart from their cultures, and that more complex societies owe their greater strength or prosperity solely to fortunate accidents such as that of geography.
— Nicholas Wade A Troublesome Inheritance: Genes, Race, and Human History
History followed different courses for different peoples because of differences among peoples’ environments, not because of biological differences among peoples themselves.
— Jared Diamon Guns, Germs, and Steel: The Fates of Human Societies
The primary reason that natural philosophers began to classify humans into different races is that human populations look different from one another. Their skin colors, hair textures, facial structures, and stature all differ, often in predictable ways. Furthermore, these differences reflect their divergent geographical origins. In fact, researchers can classify human variation by continent quite accurately using only data from the human skull. (They are able to correctly classify human skulls into black and white Americans with about 80% accuracy, using only two variables.) Therefore, despite the common charge that racial classification is ipso facto racist, and that most Enlightenment typologies of human variety were motivated by prejudices and a desire to rationalize imperial domination, ordinary people and Enlightenment philosophers also took to classifying human differences for the mundane reason that such differences actually exist.
— Bo Winegard, Noah Carl Superior: The Return of Race Science—A Review

A more plausible conception of race, one that is consistent with how careful philosophers and geneticists use the term, recognises that: When humans began leaving Africa around 75,000 years ago, they dispersed across a much greater range of environments than they had previously inhabited. The humans that settled in different geographic regions subsequently came under different selection pressures (e.g. temperature, seasonality, altitude). Natural barriers such as oceans (e.g. the Atlantic), deserts (e.g. the Sahara) and mountain ranges (e.g. the Himalayas) impeded gene flow between different populations for substantial periods of time. When there is limited gene flow between populations that have come under different selection pressures, we would expect them to gradually diverge from one another over via the processes of genetic drift and natural selection.

— Bo Winegard, Noah Carl Superior: The Return of Race Science—A Review