TUESDAY JUNE 20, 2006 - SACRAMENTO, CA  A Daimler-Chrysler fuel cell vehicle (FCV) parked outside the home of Catherine Dunwoody, Executive Director of the California Fuel Cell Partnership (CAFCP) in Sacramento, CA, on Tuesday, June 20, 2006. The FCV is a fleet vehicle on loan from Daimler-Chrsyler which every CAFCP employee drives for a week as part of the partnership's outreach program and to allow the company to test real-world application of its technology...The CAFCP is a collaboration of 31 member organizations working together to promote the commercialization of hydrogen fuel cell vehicles (FCV). CAFCP members include automotive manufacturers, energy providers, government agencies, fuel cell technology companies and transit agencies. Some challenges to the members'  goals are that most current FCV's can only travel 100-150 miles before refueling, fuel cell life has yet to reach that of traditional vehicles, there is a lack of hydrogen fueling station infrastructure, and a lack of public understanding about FCV's...Hydrogen fuel cells combine hydrogen with oxygen across a catalytic membrane to produce electricity which is then used to power an electric motor. Considered a 'green' power supply because it has no other by products except for heat and water critics are skeptical about what the hydrogen source is; fossil fuels like natural gas and petroleum are often stripped of hydrogen in order to run fuel cells, something critics state is not very 'green' or sustainable.