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Nature 448, 853 (23 August 2007) | doi:10.1038/448853b; Published online 22 August 2007

Open Innovation Challenges

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Market watch

Colin Macilwain

The global plunge in stock markets over the past three weeks has taken the wind out of the sails of clean-energy stocks, ending a powerful run that saw their value grow by some 40% in the year to mid-July.The WilderHill New Energy Global Innovation Index (NEX), which tracks a number of companies around the world with strong interests in renewable energy, plateaued in July and then tumbled this month, along with the general stock markets.

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