Crystal Davis looks at urbanization and its impact on environment and development in Part I of a three-part series. Check out other analysis by Crystal at http://earthtrends.wri.org.
Now home to half of the world’s people, …

A man making his own biodiesel. Photo by Mike Murrow from Flickr.
In Kilmarnock, Scotland, bus passengers will soon be able to pay their fare with used cooking oil instead of cash. Eight buses carrying …

Using satellites to map pollution. Photo by kennethg from Flickr.
With the help of satellites, scientists are now measuring and mapping concentrations and global movements of air-pollution and, through a cool new project known as …

A biker struck by a car in Beijing. Courtesy of pmorgan of Flickr.
It’s helpful to think about traffic safety with the following thought experiment: What would happen in a democratic forum, if the world’s …