Fernando Serpone Bueno and Veridiana Sedeh
In fast-urbanizing planet, Sao Paulo develops model toolkit to improve housing for poor, dispossessed.
Sao Paulo
São Paulo's Favela Paraisopolis. Photo: Roberto Rocco

São Paulo Seventh largest among the world's metropolises and the linchpin of Brazil's booming economy, São Paulo presents a globally relevant case study of stepped-up efforts -- but continued deep challenges -- if cities are to correct the deep poverty and environmental perils of massive slum settlements.

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Jay Walljasper
Chicago models ambitious Climate Action Plan to slash carbon emissions and handle warming

Chicago Nation states' failure to reach far-reaching accord at the Copenhagen summit may have dashed-- for now -- hopes of unified global action on climate change. So who must now step forward to face the 21st century's gravest problem? Clearly, it's cities and metropolitan regions, home now to a majority of mankind, generators of 80 percent of the world's carbon emissions.

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Birgit Heitfeld
Berlin's "Neighborhood Mothers" program reaches out to immigrants, suggests global model

Berlin Turkish bakeries, delis, Oriental supermarkets and Döner Kebab (burger) stores. Mosques, hairdressers, a Turkish Airlines travel agency and Arabian shops. The mix gives the Berlin neighborhood, or "kiez," of Northern Neukölln a colorful, quirky feel. Some call it "Little Istanbul," others Berlin's "Lower East Side" for its companion mix of artists and intellectuals.

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