Portland, Oregon was recently ranked the greenest city in America by Popular Science as it receives half of its power from alternative energy and it has 35 LEED certified buildings.
In 2006, Stockholm, Sweden implemented a permanent congestion tax for those entering the center of the city by car which has led to a 22 percent decrease in traffic and decreased emissions by over 10 percent.
Curitiba, Brazil has become a model for creating innovative public transportation for its citizens.
Learn more about these cities' green initiatives—from the National Building Museum's sustainability series, For the Greener Good.
Presented in partnership with the National Capital Planning Commission and the Capitals Alliance, this program features leaders from around the world sharing important legislation and environmental changes as part of an effort to create a more sustainable planet.