If you asked the average American about declining fertility, he'd think you were talking about soil conditions, crop rotation or the weather. Most lack the awareness to even begin discussing what could be the greatest crisis of the 21st century. Not that I blame them. The media and political elite have us chasing after illusions – like global warming, so-called over-population, and "white privilege" – so we miss the reality of a disaster that's almost on us. In terms of demography, fertility refers to the number of children the average woman will have in her lifetime. Roughly 2.1 is needed...