Does heat from friction contribute to global warming?

Earth’s atmospheric temperature is increasing faster than climate change models predict. Heat from anthropogenic friction may explain this observation. Conservation of energy dictates that energy used to propel and stop vehicles eventually becomes heat. This previously unacknowledged heat emanates in part from vehicular boundary layer aerodynamics and braking systems. The number of aircraft and ground-based vehicles in use suggests anthropogenic frictional heat may be a significant contributor to global warming. These observations support much wider use of regenerative braking systems.