Sustainable Transport   http://www.eta.co.uk/ ETA.co.uk Environmental Transport Association - campaigning for a sound and sustainable transport system     London Congestion Charging Links   http://www.staffs.ac.uk/schools/sciences/geography/cast/casthome.html CAST - The Centre for Alternative and Sustainable Transport at Staffordshire University   http://www.managenergy.net/news/news.html 'Sustainable Transport - Good practice at local and regional level'   http://europa.eu.int/comm/environment/trans/ 'Developing a Sustainable Transport System'   http://www.greenhouse.gov.au/transport/ Australian Government's sustainable transport site   http://www.sustrans.org.uk/ Sustrans.org.uk Sustainable transport charity working on practical projects to encourage people to walk, cycle and use public transport http://www.fuelcellworld.org/home-wfc.fcm?language=1&subsite=1172 World fuel council   http://www.eere.energy.gov/RE/hydrogen_fuel_cells.html US Department of energy - hydrogen fuel cells explained   http://www.fueleconomy.gov/feg/fuelcell.shtml Fuel Economy.gov/feg/fuel cell US Dept of Energy - Fuels cells, benefits and how they work   http://www.fuelcelltoday.com/ Portals for companies and individuals with an interest in the commercialisation of fuel cells   www.traveline.org.uk. Public transport Information   http://www.airquality.co.uk/archive/index.php   AirQuality.co.uk UK National Air Quality Information Archive