DAVIS, CA - APRIL 20: California governor Arnold Schwarzenegger gives the thumbs-up as he uses a hydrogen fuel pump to fill a Toyota fuel cell vehicle April 20, 2004 in Davis, California. Gov. Schwarzenegger today announced the California Hydrogen Highways Network through the signing of an Executive order creating a public and private partnership to build a Hydrogen Highway in California by 2010. (Photo by Justin Sullivan/Getty Images)
