** ADVANCE TUESDAY SEPT. 4 ** Environmentalist and car junkie Colette Brooks with some of her collection of vintage cars that run on biodiesel fuel, at her home in Malibu, Calif., Thursday, April 19, 2007. With her earth-friendly car finder service, Biobling, Brooks is one of many entrepreneurs turning gas guzzlers into green machines as the interest in alternative fuel steadily spreads nationwide. (AP Photo/Reed Saxon)