Every time a train rumbles to a stop ... residents and tourists take 440 million trips on Barcelona’s subway system, which ...

Enter Barcelona's MetroCharge project, which uses brake energy from the underground trains to power those same vehicles, as well as stations and their escalators, ventilation, and lighting systems.

The speech echoed many of the themes he sounded at his first inauguration in 2017 when he spoke darkly of the "American carnage" of crime and job loss that he said had ravaged the country.