Some researchers have been sounding alarms for years over the change in sex ratios in developed countries and have in the past blamed pollutants and synthetic chemicals such as those found in some pesticides which disrupt human hormones.

• 近年来，一些研究人员一直在就发达国家的性别比率问题发出警告，并将这一问题归咎于各种污染物以及一些杀虫剂中所含的化学合成物，这些物质会损害人类的荷尔蒙。