Europe’s birth rates keep falling despite cash grants, generous parental leave and other incentives; from the Ukraine war to economic pressures and green ideology, the causes vary; if the trend continues, the continent could be transformed — with the young first to rebel Sigrid is a 48-year-old Danish woman. Twenty-five years ago, we studied together at the same university in New York. One night, after a lot of alcohol, we made a bet: Who could hold out longer without settling into the conventional routine of marriag... [18002 chars]