h/t Atrios, who points out that Barcelona is another city boasting a wildly popular public bicycle supply system called Bicing, where for a pittance you can become an annual subscriber and have the world's most efficient machine available to get around the city. Global warming is destroying the world. Given that urban areas have the slowest moving traffic and hugest number of cars, it's a fair guess that their share of global warming is at or near the top. Bicycles can reduce or eliminate that problem. Therefore, bicycles will save the world.
Don't bother arguing with me about this.