Re: World Population Growth
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The vast majority of the world's population live off the intelligence and production of others (to wit, "stupid" and unhealthy people can easily survive and reproduce). Medicine has advanced to the point where "traditional" evolution no longer works right.
In a sense, we are "devolving", yet our population continues to grow.
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Natural selection doesn't tend to occur in large populations, especially given humans' capability to travel vast distances and increase heterozygosity. Even if the "less intelligent," who are really only less intelligent in certain ways, outpace the "intelligent" in relative fitness, the "intelligent" still increase as a population in absolute terms.
Now, if there was a natural disaster, or artificial disaster that suddenly decreased the overall human population, probability would favor the "less intelligent" to survive. Without some sort of major disruption that cuts a small group of humans off from the rest of the world, or a drastic reduction in the overall population of the species, no speciation will occur.
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