The most important revolution in human history was the invention of agriculture according to Ronald Wright. This invention was more important than the development of any type of tool or material, such as metals. Agriculture was probably discovered by women in various locations around the world independently.

More important than hunting to extinction the large animals which had been the main source of food, forcing humans to become more vegetarian, was the climate. The climate about 10,000 years ago became stable. The extremes disappeared making agriculture possible for the first time in history. Fluctuations between ice ages and heat waves ceased, allowing crops to be cultivated.

This led to urbanisation and is still today the basis of our urban lifestyle.

Climate change, caused primarily by automobiles, threatens to destabilise this climatic equilibrium, and thereby threatens the basis of our worldwide civilisations. The biggest contribution to stabilising the climate would be the adoption of a rational transport system instead of the car.