The grey sky continues here in England. Five and a half thousand years ago, newcomers arrived in Britain. Did they see the same weather? Maybe they landed in summer. Why did foreigners leave their own land? Were they persecuted, hungry or merely exploring? So far, nobody has found a reason.
Whenever it happened, the explorers changed the local population's outlook. Along with their intelligence to make ceramic cooking pots, they also brought rats in their grain. Within two generations, people faced extreme physical violence from each other because of their switch from hunters to farmers. To grow cereal and herd cattle, they needed land and, with it, protection from anyone wanting to take over. From then on, ownership played a major role in events. They armed themselves with weapons, not for their prey, but for their neighbors.
The human population increased because of the life-style so they could no longer hunt. No going back. The rats took advantage of the food supply.