... having been breathed out

(Possibly obviously: content warnings for racism.)

In a comment on this post on Richard Burton's theory of a climatic "Sotadic Zone" within which sodomy supposedly naturally occurred with great frequency, chestnut_pod recommended Ibram X. Kendi's Stamped from the Beginning as a source for a run-down of this climate-based theory generally, and also for a good examination of the history of racist ideas in America. I've just picked it up and am so far finding it compelling—particularly Kendi's focus on the systems of power and oppression that racist thought is produced to justify. Anyway, he does indeed get into the climate theory adapted by Burton among (apparently) many, many others, starting with its basis in Aristotle (bolding added):

Aristotle, who lived from 384 to 322 BCE, concocted a climate theory to justify Greek superiority, saying that extreme hot or cold climates produced intellectually, physically, and morally inferior people who were ugly and lacked the capacity for freedom and self-government. Aristotle labeled Africans "burnt faces"—the original meaning in Greek of "Ethiopian"—and viewed the "ugly" extremes of pale or dark skins as the effect of the extreme cold or hot climates. All of this was in the interest of normalizing Greek slaveholding practices and Greece's rule over the western Mediterranean. Aristotle situated the Greeks, in their supreme, intermediate climate, as the most beautifully endowed superior rulers and enslavers of the world. "Humanity is divided into two: the masters and the slaves; or, if one prefers it, the Greeks and the Barbarians, those who have the right to command; and those who are born to obey," Aristotle said. For him, the enslaved peoples were "by nature incapable of reasoning and live a life of pure sensation, like certain tribes on the borders of the civilized world, or like people who are diseased through the onset of illnesses like epilepsy or madness."

Kendi goes on to discuss a strain of thought he calls "assimilationist," which he identifies as one of the three main strains of thought on race in the US, and which he first traces to 14th-century North Africa, citing Ibn Khaldun and The Muqaddimah, "the foremost Islamic history of the premodern world," which also draws on Aristotle's climate theory:

"The Negro nations are, as a rule, submissive to slavery," Khaldun surmised, "because (Negroes) have little that is (essentially) human and possess attributes that are quite similar to those of dumb animals." And the "same applies to the Slavs," argued this disciple of Aristotle. Following Greek and Roman justifiers, Khaldun used climate theory to justify Islamic enslavement of sub-Saharan Africans and Eastern European Slavs—groups sharing only one obvious characteristic: their remoteness. "All their conditions are remote from those of human beings and close to those of wild animals," Khaldun suggested. Their inferior conditions were neither permanent nor hereditary, however. "Negroes" who migrated to the cooler north were "found to produce descendants whose colour gradually turns white," Khaldun stressed. Dark-skinned people had the capacity for physical assimilation in colder climate. Later, cultural assimilationists would imagine that culturally inferior African people, placed in the proper European cultural environment, could or should adopt European culture. But first physical assimilationists like Khaldun imagined that physically inferior African people, placed in the proper cold environment, could or should adopt European physicality: white skin and straight hair.

Kendi's focus in both of these passages remains strongly tied to the extant policy or practice which Aristotle and Khaldun were striving to justify: enslavement of specific other peoples. Which makes sense, since his overarching thesis statement is thus (including because I find it both useful and invigorating):

Hate and ignorance have not driven the history of racist ideas in America. Racist policies have driven the history of racist ideas in America. And this fact becomes apparent when we examine the causes behind, not the consumption of racist ideas, but the production of racist ideas. What caused US senator John C. Calhoun of South Carolina in 1837 to produce the racist idea of slavery as a "positive good," when he knew slavery's torturous horrors? What caused Atlanta newspaper editor Henry W. Grady in 1885 to produce the racist idea of "separate but equal," when he knew southern communities were hardly separate or equal? What caused think tankers after the presidential election of Barack Obama in 2008 to produce the racist idea of a postracial society, when they knew all those studies had documented discrimination? Time and again, racist ideas have not been cooked up from the boiling pot of ignorance and hate. Time and again, powerful and brilliant men and women have produced racist ideas in order to justify the racist policies of their era, in order to redirect the blame for their era's racial disparities away from those policies and onto Black people.