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Nature 436, 625 (4 August 2005) | doi:10.1038/436625b; Published online 3 August 2005

Market Watch

Stocks in companies dedicated to energy efficiency and renewables have surged forward this summer on mounting evidence that governments — and markets — are taking alternative energy more seriously.The WilderHill Clean Energy Index (ECO on the American Stock Exchange) rose in value by almost 20% during June and July (see graph) as high oil prices, together with various corporate and political initiatives, bolstered investors' confidence in the sector.

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