The BBC reports on the gender imbalance among children in China. Something like 118 boys are born for every 100 girls. A similar situation has developed in India.
In both of these huge countries, albeit for somewhat different reasons in each, many couples prefer having sons. As a result, many female infants are aborted or abandoned.
A few years from now, 1 out of 6 Chinese men of marriageable age will not be able to find a wife. The geopolitical implications of this imbalance are disquieting. We may see social unrest or invasions of neighboring countries to steal 'brides.'