> Bozick found that, over the past two decades, the number of childless men who do not want children has doubled. Meanwhile, the number of men who said that it

> Bozick found that, over the past two decades, the number of childless men who do not want children has doubled. Meanwhile, the number of men who said that it was important to have parental leave decreased between 2005 to 2015. The study cites data from the U.S. Census Bureau estimating that 39.4% of men over the age of 15 have no children, “constituting a sizable share of the population that at present is poorly understood.” Given current technology, the only known way to roll back the amount of carbon entering the atmosphere to the levels required to put an end to anthropogenic climate change is population reduction. The most humane way to do that is to limit the number of children being born. I expect part of the explanation to be economic and the other part due to the realization that having families as was done in the past is paradoxically incompatible with future survival of the species.