February 21, 2011, 5am PST
Construction is nearing completion on the longest railway tunnel in the world.
February 3, 2011, 9am PST
The small town of Perugia, Italy has left its traffic worries behind by implementing various driving restrictions and transportation solutions like escalators and a "minimetro".
February 3, 2011, 6am PST
Beneath Paris is an underground network of tunnels and quarries, long closed to the public. <em>National Geographic</em> takes a tour of this forbidden part of the city, where urban explorers keep tradition alive.
January 3, 2011, 1pm PST
National Geographic tackles the controversial issue of population growth, and the sustainability of a growing population. Should we worry about maxing out the planet? Not necessarily, according to Nat. Geo.
December 28, 2010, 7am PST
The federal government set aside $5.5 billion in stimulus funding to retrofit its huge fleet of buildings. $4.5 billion is to be spent on green building projects, some of which have already been launched.
August 5, 2010, 10am PDT
Carbon dioxide is one of the most widespread greenhouse gases produced by humans. Trees can absorb it, but release it when they die. Scientists are looking to build artificial trees to do the job permanently.
July 28, 2010, 6am PDT
A new report from the Natural Resources Defense Council shows that many parts of the Great Plains and the Southwest U.S. are facing severe water shortages in the near future.
March 23, 2010, 8am PDT
This article from <em>National Geographic</em> examines the rapidly depleted Jordan River and how saving it could bring Israel and its quarreling neighbors together.
March 18, 2010, 7am PDT
This piece from <em>National Geographic</em> takes a look at the three-year drought that's plaguing California's cities and farms.
February 20, 2010, 9am PST
Small-scale nuclear reactors could be a new, cheap way to provide power for neighborhoods. But their inherent controversy remains.
August 4, 2009, 11am PDT
The Sahara desert is becoming increasingly green, according to satellite imagery -- which scientists are attributing to rising temperatures associated with global climate change.
May 26, 2009, 11am PDT
The Seasteading Institute, a group that advocates creating sovereign nations in international waters, announces the winner of their seastead design contest.
May 7, 2009, 9am PDT
Advances in material development have brought to the market a new type of concrete that can bend under pressure and heal cracks with the addition of water.
April 21, 2009, 6am PDT
This piece from <em>National Geographic</em> looks at how green roofs are sweeping across the tops of buildings all over the world.
August 31, 2008, 1pm PDT
Anthropologists have discovered traces of highly organized and gridded cities in the Amazon rainforest dating back to the 1200s.
April 18, 2008, 5am PDT
<p>This article from <em>National Geographic</em> looks at the construction boom that is rapidly changing the face of Beijing.</p>
January 21, 2008, 10am PST
<p>This article from <em>National Geographic</em> looks at the increasing strain on the water supplying the western U.S.</p>
December 26, 2007, 10am PST
<p>National Geographic launches a new green cities blog called The Ecopolitan, written by Jay Walljasper, Senior Fellow of the Project for Public Spaces, and Executive Editor of Ode magazine.</p>
December 25, 2007, 7am PST
<p>Competing ancient claims to land, religious fervor and the construction of a massive "security" wall make Bethlehem the most contested city on Earth.</p>
July 10, 2007, 10am PDT
<p>As the Central American country moves forward with plans to expand the width of its heavily-used canal, locals and scientists question whether a reforestation plan along canal banks will affect the area's supply of drinking water.</p>