Something happens around 12800 years ago and that led to some big changes in our way of life. Some people thinks that agriculture and civilization started at that time. Maybe we had some previous civilizations but, for me, the more important question is why we started agriculture in the first place.
I do not think agriculture is an easier way of life or an easier way to get food. When I look at fishermen, I see hunting and specially trapping is a lot easier than agriculture.
There is a point to make about the stability of food supply with agriculture. Then again, we are starting to see the benefits of fasting in our current time.
I suspect also, that a fixed system (agriculture) is subject to variations in the environment (flood, drought, hurricanes, twisters, etc.), the same as moving systems (hunting, gathering, fishing, trapping, etc.), but the advantage of moving systems is that they can go to more stable places.
Civilization is based on trade. In the case of modern fishermen, it is easy to see that they are trading. Maybe it would be possible to create an entire civilization not based on agriculture.
“Earth Sciences Professor Edward Keller of the University of California at Santa Barbara writes as follows: “If the hypothesis of the impact is correct (and I am very impressed with the data) it is perhaps the most important hypothesis in the Earth Sciences,…”