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308 billion $ to build enough algae farms
The University of New Hampshire Biodiesel Group said it would cost $308 billion to build enough algae farms to replace gasoline with algae-based biodiesel, and $47 billion per year to run the production system for 140 billion gallons, or $0.34 per gallon before transportation and retail costs. The National Renewable Energy Laboratory said it would take an algae field of up to 15,000 square miles