The United Nation's 2013 Human Development Report warns that without serious changes billions of people could be pushed into extreme poverty.
Here's what Americans don't get about cycling - and why it's a problem
Some residents of Manchester, where 90 percent of the tar sands crude would be processed, are fighting the development of the Keystone XL pipeline.
The 21st century economy will be urban, high tech, and green
Energy CEO: Solar should break up with wind, date natural gas, have distributed babies
Gentrification is happening in cities throughout America, but some school districts are implementing policies to encourage diversity and provide opportunities.
Following a flurry of transit-oriented development, the city of Denver is moving away from suburban sprawl and toward denser more sustainable communities.
In a diversifying economy, sociologist Stephen Klineberg says urban development and beautification efforts are needed to attract a talented workforce.
Commentary
Jarrett Walker
The driving boom is over
William Lindeke
7 reasons conservatives should embrace bikes
Guy Sorman
Superrich donors are making Dallas a twenty-first-century city
More Commentary