In terms of major evolutionary changes, I think we're done. There are no evolutionary pressures anymore now that our weak can survive and I don't think we will have a major evolution as long as our tech keeps improving
That's true in the inter species, macro sense, assuming all the current variables remain constant.
There is, however, a major evolutionary shift that has been ongoing since the early 18th century and, it's one that really dominates this board, though few probably realize it: intellectual stratification. Richard J. Herrnstein and Charles Murray's Bell Curve: Intelligence and Class Structure in American Life
(1994) explored the topic, but the got serious blow-back from the touchy-feely PC crowd over some of their conclusions. Essentially, intelligent people marry people with equal or superior intelligence. The standard deviation for offspring IQ is +/- 10 pts. In pre-industrial, rural, agricultural societies, people didn't move around a lot and tended to intermarry with their neighbors and those within the community. Consequently, the intellectual development of the people remained generally consistent. That kind of regression to the mean doesn't happen in modern, industrialized economies where the ease of mobility puts upward pressure on the intellectual mean.
By contrast, industrialization has created pretty sweeping migration trends within the human population. In the 18th and 19th centuries, many of Europe's best and brightest moved to the United States. Those immigrants fled oppressive economic and political establishments that stifled growth and suppressed national identities. By the early 1900s, however, many of the Northwestern European nations had adopted the free-market, industrial capitalism of the US and migration from those countries slowed to a trickle. Those nations that clung to the repressive ways (Italy, Austro-Hungary, Poland, Russia, the Balkans, etc.), though, fueled another round of immigration to the New World.
Since World War II, that kind of immigration has taken place with the peoples of the former European colonies, but with a twist: the intelligentsia of these countries moves to Europe and US. The best and brightest Indian, Pakistani, Ethiopian, Egyptian, and Korean scholars, doctors, engineers, and so forth, move to the US, Canada, and Europe, creating an intellectual vacuum in those nations and fueling the intellectual evolution of the nations they immigrate to.
Within those nations, additional intellectual stratification is occurring. College educated people marry other college graduates. People with graduate degrees tend to marry other graduate degree holders. On average, those people have higher IQs and their children inherit those traits (@30% of them develop IQs up to 10 points higher than their parents, @30% develop IQs up to 10 points lower than their parents, 15% will have IQs 10+ greater than their parents). Those trends are exacerbated by the living patterns - intelligence leads to wealth and the ability to adapt to the evolving economy and these people tend to live in the same areas and go to the same schools. Think about it - there's a reason why the best schools in Alabama, for example, are in Mountain Brook and Huntsville. These parents give their kids opportunities - they send them to good schools, including private ones, they provide intellectually stimulating environments, and they afford them the economic comfort necessary for intellectual achievement.
On the other hand, the same process is working in reverse on the other end of the scale. Dropouts are spawning with other dropouts; dopers are having kids with dopers; and the rare offspring born with greater intelligence than his/her parents leaves the community as fast as they can: think of the famous rags-to-riches stories you hear about. These people tend to live in the same areas and they develop a culture that celebrates ignorance and deplores achievement . Think here the "Somebody gots to pay for my 15 kids woman," for example.
Eventually, this is all going to come to a head and it's going to get ugly.
This post was edited on 2/9 at 2:52 pm