By 2030 the number of urban dwellers will have exploded to 4.8 billion people, roughly 60 percent of the projected world population, whereas only 13 percent lived in cities in 1900. In its 8 February 2008 issue, Science explores the ramifications of urban transformation. News articles offer an on-the-ground look at how cities are tackling specific problems from poverty and sanitation to traffic jams.
Reviews and Perspectives examine how cities take shape and the impacts of urbanization on the environment, human health, economic growth, and the demographics of the developing world.
For those interested in Cities the issue is well worth a look, see http://www.sciencemag.org/ for more info.