By some estimates, there are already more than two billion bikes in use around the world. By 2050, that number could be as high as five billion. Over 50 percent of the human population knows how to ride a bike. In China, 37.2 percent of the population use bicycles. In Belgium and Switzerland, 48 percent of the population rides. In Japan, it is 57 percent, and in Finland it’s 60 percent.

The Netherlands holds the record as the nation with the most bicycles per capita. Cyclists also abound in Norway, Sweden, Germany, and Denmark.

The Danish capital, Copenhagen, is considered the most bicycle-friendly city in the world.

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