Climate Change causes Civilization
Humans evolved about 200,000 years ago in Africa. For most of the time since, we have lived as hunter-gatherers. There were fits and starts at agriculture, but nothing really "took."
And then, starting about 10,000 years ago, we figured it out. We domesticated wheat, oats and barley, and other grains. We started herding cattle, sheep, and goats. We built villages and towns.