Excuse me, if this is the wrong sub for this but I’m genuinly confused. According to [this graph](https://flic.kr/p/5T5hkE) I found by accident, the world population barely increased at all between 1300 and 1900. And then it suddenly took off like crazy. What caused this sudden fast increment of the world population?
In: 78
1. The development of synthetic fertilizers -> massive increase in agricultural output.
2. The production of cheap steel (the production of steel increased by more than 20-fold between 1880 and 1910), leading to rapid expansion of railroads.
3. Development of the internal combustion engine cargo truck. Effective link between the trainstation and the store.
4. Development of practical refrigeration units and the refrigerated train car. Fruit, fish, meat etc could now be transported vast distances. From 1910-ish we also see the development of home refrigerators.
5. Major cities developing a comprehensive sewage network, plus other advances in sanitation.
6. Increasing advances in medicine. Things like effective disinfectants and anaesthesia (meaning that internal surgery was no longer just a pipedream or a measure of last resort).
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