In OTL people developed agriculture around 8000 BC. In this TL, a temperature change appeared that made the world temperature a little higher and because of that people weren't that dependent on each other to survive. Because of that, people did not develop agriculture until later at around 6000 BC. Then around that time a great fire emerged in Mesopotamia that spread toward the Nile River and burned a lot of primitive agriculture and crops. This fire was a result of the dryness in the air because of the great temperature change. Later more fires emerged in other areas such as the Indus Valley, Danube River, Greece, and Yangtze River. Because of these fires the discovery of agriculture didn't happen until about 4000 BC. Around 3600 BC the first primitive cities were formed and a little ice age appeared.