Cynthia Warner, a 20-year veteran of the oil industry, is now the president of algae-based fuel developer Sapphire Energy. Algae doesn't require much land or water to grow, can be used by motorists without costly modifications to existing fuel infrastructure and will help curb greenhouse-gas emissions, Warner said. Sapphire expects that its pilot program, which is set for next year, will produce up to 1 million gallons of algae oil annually, rising to 100 million gallons by 2018 and 1 billion gallons by 2025.

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