Population > 1.7 million

Leading indicator > Europe's least-polluted major city, says Cushman & Wakefield

Fast companies > Ericsson; H&M; clean techies Envac and Fortnum

Home to almost 2,500 green-sector companies and powered by the research output of its Karolinska, Beijer, and IVL institutes, Stockholm is the fuel cell under the hood of a country that aims to be oil-free by 2010. Its Hammarby Sjöstad district is a living eco-laboratory of 4,000 apartments with quadruple-glazed windows, ovens and cookers that run on biogas from wastewater, and central heating wired to photovoltaics.

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