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Nature 447, 1045 (28 June 2007) | doi:10.1038/4471045b; Published online 27 June 2007

Open Innovation Challenges

Market watch

Colin Macilwain

Stocks in renewable-energy companies around the world have continued to rise this spring, confounding widespread expectations of a market correction — at least for the time being.The WilderHill New Energy Global Innovation index (symbol NEX on the American stock exchange) hit record highs again this month (see graph) and the basket of stocks it contains is now worth almost four times as much as it was in 2002.

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