However, both reciprocal crosses produce sterile hybrid males and females with decreased fertility. (en.wikipedia.org)
An expanded, energetic view of the demographic transition is that increasing energy use yields increasing development, thus decreasing mortality, and eventually decreasing fertility. (journals.plos.org)
Over the last few decades, many international organisations and governments have aimed to reduce agricultural production while environmentalists, claiming that that «climate change is happening now» worried about decreasing fertility. (climate-resistance.org)