Because if we stop exploiting Africa and polluting the air, they down there will start doing it then. [...] I am in favor of the one-child policy worldwide. For about 20 years to begin with.
The Chinese implemented your harebrained idea more than 20 years ago, just take a look at how happy they are with the result :-(
Your assumptions and conclusions are pure Eva Herman logic. (Only) if we act differently - and that is implemented faster and more radically by our offspring than by the older generations - then we give the emerging developing countries other role models. The only children in China are just reaching the age where they become the new buying potential for Dieselgate VWs. And otherwise, only children are typically not exactly "leading" in social matters. There may be fewer children - but children who have learned to share less (with others and with nature).
That must be something local. Translate it into Saxon or High German.
Heu-wä-gel-chen (little hay wagon) is a metaphorical term meaning that hot-headedness needs time to dissipate. And it gets that time when you breathe deeply as long as it takes to slowly pronounce a multi-syllabic word. The wagon used to transport the hay was often pulled by slow old animals.
Hay is bulky but light, little hay wagons rattle along leisurely. Does Saxon livestock not eat hay, or are you an urban child?