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Business
Nature 435, 735 (9 June 2005) | doi:10.1038/435735b; Published online 8 June 2005
Market watch
Companies in the renewable-energy sector saw their market valuations slip back in April, and then regain some ground last month.The WilderHill Clean Energy Index (ECO on the American Stock Exchange; see graph) reflects the subsectors that make up the renewable-energy industry.
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