Suppose two problems face civilization: (1) A lack of honeybees could destroy civilization as we wouldn't be able to pollinate plants and make food (Honeybee problem) (2) Too many dumb people/not enough smart people have babies so we'll all become dumb (Dysgenics problem)
No, it isn't because it has nothing to do with differential reproduction. Unless you believe leaded gasoline causes higher IQ couples to reproduce less.
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Lots of reasons - if selective pressure caused that height then it's relaxed if no one expresses that height. Mutations creep in, advantageous alleles are lost. Second is that as soon as you remove the environmental insult you go to the genetic potential - it's a simpler problem
End of conversation
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