Traffic planners restrain cars in favor of walking and public transit

"Loop" renovation transforms Williamsburg residence

Republican governors working to ease environmental rules.

Alex MacLean goes airborne to document the complex relationship between humans and nature.

Norman Foster's visionary city rises outside Abu Dhabi.

26-hour flight confirms viability of emissions-free air travel.

But wildlife conservation groups oppose the project, the New York Times reports.

Denver, Minneaopolis and Boston set to launch bike share programs in 2010.

In Portland, a federal green building project takes shape.