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Since purple sea urchins have eaten up their food supply, many of them are empty inside. Erika Mahoney/KAZU hide caption

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Erika Mahoney/KAZU

Saving California's Kelp Forest May Depend On Eating Purple Sea Urchins

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Kelp plants grow on a 30-foot-long, white PVC pole suspended in the water. If this is successful, instead of just one row, there would be a whole platform, hundreds of meters across and hundreds of meters deep, full of kelp plants. Courtesy of David Ginsburg/Wrigley Institute hide caption

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Courtesy of David Ginsburg/Wrigley Institute

Scientists Hope To Farm The Biofuel Of The Future In The Pacific Ocean

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Matt Kern harvests wild bull kelp for salsa that he and his partner, Lisa Heifetz, are selling as part of his new business. Courtesy of Matt Kern and Lisa Heifetz hide caption

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Courtesy of Matt Kern and Lisa Heifetz