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Alright, basically...
Agriculture started giving us less nutrients despite giving us more calories. We could raise more people, but they were generally less healthy than the fewer people doing hunting and gathering, due to worse diets.
They also started being packed closer together since agriculture encourages it, thus starting epidemics and diseases such as tuberculosis started becoming a huge problem.
Starvation also became a worse problem since crops failing would easily mean enormous amounts of food would go missing. Food reserves, only a thing due to crops, also started the creation of class systems since not everyone had to work for food, eventually causing war. It supposedly started divisions between the sexes as well.
Thus, the writers believe agriculture was a major mistake and that given a choice and knowledge of what it would have done, hunter-gatherers would not have started agriculture.
You're welcome, anon. Now please, do it yourself next time.