To reduce greenhouse gas emissions and improve security of energy supply the European Union aimed at a substitution of 10% of the conventional fuels (conventional diesel and gasoline) in the road transport sector before the year 2020 (VROM, 2007).
Also a reduction of 20% greenhouse gasses in 2020 compared to the levels of 1990 was proposed by the European Union in 2007.
The transport sector accounts for about 31% of European energy use (EEA, 2008) and 25% of the European CO2 emissions. A large part of the CO2 emission reduction can be achieved by introducing alternative fuels and drive trains, like hydrogen, fuel cell technology and electric powered vehicles. These alternatives also can help reduce the dependence on oil from unstable regions in the Middle-East.