On the PLOS blog (found via Medium) there was a really interesting post discussing the intersection of environmental conditions and genetics, and their impact on human evolution. The title may be either off-putting or funny to some, but it’s worth a read both on general interest or to those who have a particular interest in either human evolution or environmental science. Other than using the clinical term for the male genitalia, totally safe for work:
An Italian study in 2012 found that men’s penises were growing smaller over time — two centimetres lost from grandfather to grandson in the twentieth century. Conservative radio bloviator Rush Limbaugh knew who to blame: ‘feminazis, the chickification, and everything else’ linked to feminism. Other commentators, a bit more scientific, pointed the finger at endocrine disrupting chemicals, such as pesticides and hormones fed to cattle, as likely culprits.
To anticipate how xenoestrogens or any other synthetic chemical that influences fertility might affect human evolution, it helps to consider niche construction theory.
It goes on from there. Go read it.