Conversation so far:
What was the neolithic revolution?
The Neolithic Revolution, also called the Agricultural Revolution, marked the transition in human history from small, nomadic bands of hunter-gatherers to larger, agricultural settlements and early civilization.
When did the Neolithic revolution start and end?
The Neolithic Revolution—also referred to as the Agricultural Revolution—is thought to have begun about 12,000 years ago.

Question: Why did it start?
Self-contained rewrite: Why did the Neolithic revolution start?