Boy rides a public bus in Seoul. Photo by Andrew Griffith. Buses are the main public transit mode worldwide. In the U.S. alone, there are roughly six billion bus trips per day. Most of these run on diesel fuel, a ...

Banning street barbecues is Beijing’s latest effort at improving air quality. Photo by Kaj17. Given China’s population growth, and rapid urbanization, Beijing is on its way to becoming a super city – a city with a population greater than 20 ...

Tomorrow, New York City’s Park Avenue will be turned into a cyclovia. Photo by Asterix611. Tomorrow, seven miles of Manhattan’s Park Avenue, stretching from the Brooklyn Bridge to Central Park, will be filled with people, not cars. For three Saturdays ...

Amsterdam is frequently cited as having the best bicycling infrastructure in the world. Photo by Ronel Reyes. Traffic and congestion is a common sight during rush hours around the world. After battling through hours of traffic, the hunt for a ...

An early morning tram travels down a street in Vienna. Vienna’s new buses rely on the city’s extensive tram network for electricity. Photo by Julian Turner. Vienna is home to one of the largest tram systems in the world, extending ...

While a debate continues about the future of biofuels, Brazil is currently facing an important decision for its own future. Ethanol from sugar cane emerged in the years 2000 as a potential alternative to fossil fuels and possibly a game-changer ...