One can drive across the country on algae--and a 700-pound battery pack--or so proved the crew behind the documentary Fuel Embarking on September 8 and pulling into New York City today, just in time for the film's premiere, the Algaeus covered 3,750 miles. The algae came from 22 acres of special ponds at Sapphire Energy's research and development facility in New Mexico, where local strains of the microscopic plant grow in vats of saltwater while being fed CO2 that would otherwise go into Coca-Cola and other fizzy drinks, according to Tim Zenk, a spokesman for Sapphire.