The city of Copenhagen European Green Capital 2014 is carrying out lab tests on hydrogen, electricity and biofuels for cars. By 2015, 85% of municipal passenger cars should be running on electricity or hydrogen. By 2025, the target is for 20-30% of all passenger cars in the city to use hydrogen, electricity or biofuels, with five hydrogen fuelling stations in the Greater Copenhagen area. Find out more about Copenhagen European Green Capital 2014