Germany cities host some of the most energy-efficient buildings in Europe, according to a new report from Siemens. Photo by Andreas Levers.

Light-weight vehicle sales in India in 2010 made the country the sixth-largest automobile market in the world. Photo by Ted.

When it comes to changing the way we use energy, cities are at the center of the action.

The city considered to have the most successful, and first, BRT system is Curitiba, Brazil, with 2.26 million passengers a day and 45 miles of lanes. From three bus corridors in the late 1970s, the system has grown to six, all added in combination with zoning and land-use policies that promoted industrial and residential development.

The city considered to have the most successful, and first, BRT system is Curitiba, Brazil, with 2.26 million passengers a day and 45 miles of lanes. From three bus corridors in the late 1970s, the system has grown to six, all added in combination with zoning and land-use policies that promoted industrial and residential development.

Trabalho com a imprensa, através de estratégias de marketing para a implantação do Bus Rapid Transit (BRT), foi apresentado pela equipe da Embarq Brasil, durante um workshop nesta quarta e quinta, na cidade do Rio de Janeiro.

Trabalho com a imprensa, através de estratégias de marketing para a implantação do Bus Rapid Transit (BRT), foi apresentado pela equipe da Embarq Brasil, durante um workshop nesta quarta e quinta, na cidade do Rio de Janeiro.

ITDP named Eugene, Ore.'s bus rapid transit as one of the top five systems at the cutting edge of bus innovation. Photo by functoruser.

Mexico City's Metrobus has lead to a 15 percent mode shift from cars to public transport. Photo by Eduardo Ortiz.

Bus Rapid Transit in Guangzhou, China from Streetfilms on Vimeo.