Reddit mentions of Intelligence, Race, And Genetics: Conversations With Arthur R. Jensen

One the greatest psychologists and experts in this field was Arthur Jensen. His stance was "80% of the variance in IQ in the population studied was the result of genetic factors and the remainder was due to environmental influences". Now, the "population studied" was a random sample of the general population, increasing the validity of the conclusion and evading your "greenhouse effect" example.

Jensen also claimed that the "environmental influences" that most impact IQ are fetal environment, nutrition during babyhood and early childhood. The rest has little effect.

While your insights into "heritability" are interesting, seems to me you're essentially saying "make sure the sample population is representative". Ok, but to counter the CMV claim, you'd have to demonstrate that many or most cited IQ studies are guilty of poor sampling. Are they?

And how do you square you observations with the published consensus among experts claiming "Genetics plays a bigger role than environment in creating IQ differences among individuals"?

P.S. A great book on this topic is [Intelligence, Race and Genetics] (https://www.amazon.com/Intelligence-Race-Genetics-Conversations-Arthur/dp/081334008X).