We are a force of nature – on wheels
Humans are a geological force. For instance, at any given moment there is 1.5 billion tonnes of material being moved around on wheels on the surface of the Earth, thanks entirely to our efforts. number of motor vehicles, including trucks and commercial vehicles 900,000,000 (http://carsandpeople.sdsu.edu/) number of cars in the world 750,000,000 average weight 1.3 [...]