Most people in the world lived in cities prior to the Great Acceleration.

That statement is not accurate. Prior to the Great Acceleration, which refers to the period after World War II, most people in the world lived in rural areas. Urbanization, or the mass migration of people from rural areas to cities, has been a defining trend of the past few decades. However, before the Great Acceleration, the majority of the global population engaged in agriculture and lived in rural communities.