Two years ago, the world’s population reached a major milestone, according to the United Nations Program on Human Settlements: for the first time in history, the majority of people worldwide were living in cities.

And not necessarily pleasant cities, either. The arrival of the so-called "urban millennium" also saw the number of slum-dwellers hit 1 billion.

The challenges presented by these trends will be dissected by speakers at an APA World Policy Keynote on "sustainable urbanization," beginning at 7:45 a.m. Tuesday.

Read more: http://www.finance-commerce.com/article.cfm/2009/04/25/Urban-planning-How-to-deal-with-too-many-people-in-too-little-space-As-the-worlds-population-moves-t

Source: Finance and Commerce (www.finance-commerce.com)