Bio-Beetle - Offers eco-friendly rental cars such as the Volkswagen New Beetle. The vehicles are fueled on biodiesel fuel with locations in Maui, Hawaii and Los Angeles, California. Lists FAQs, and availability calendar - http://www.bio-beetle.com/
EV Rental Cars - Rents natural gas and hybrid electric vehicles. Based at airports in Phoenix, Arizona, and Los Angeles and San Francisco California areas. - http://www.evrental.com/