In China, most people ride something like this: http://www.niu.com/ http://www.niu.com/ - small affordable (usually in $100-300 range) electric scooters that ty

In China, most people ride something like this: http://www.niu.com/ http://www.niu.com/ - small affordable (usually in $100-300 range) electric scooters that typically use 48V 20Ah batteries for a 70-80km distance. From the Niu stats, it seems like it uses about 1.1kWh/100km (in electricity), compared to a bicycle that uses about 3.1kWh/100km (in food energy, source: https://en.wikipedia.org/wiki/Energy_efficiency_in_transport#Land_transport_means https://en.wikipedia.org/wiki/Energy_efficiency_in_transport...). If the electricity produced in a "clean" way, it seems that riding an electric scooter is quite green even compared to biking. Of course, biking has a bunch of other advantages: sport and exercise, unlimited range, transportability, not mentioning mountain biking etc.