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Nature 447, 520-521 (31 May 2007) | doi:10.1038/447520a; Published online 30 May 2007

Algae bloom again

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A handful of pioneers are trying to bring algae-based biofuels back from a near-death experience. Amanda Leigh Haag reports.

On a spring afternoon in Fort Collins, Colorado, a bath of lime-green algae is glinting in the sunshine. Filling an 18-metre-long tank that sits in the parking lot of a disused power station, the bubbling liquid consists of millions of microscopic single-celled photosynthetic organisms.