As oil prices surge, hydrogen and electricity are becoming viable alternatives to petrol.
The vehicles are available in Ireland and tax breaks are expected in next month's budget on environmentally-friendly cars.
In London, there are huge financial incentives to driving green - including no congestion charge and free charges for fully electric cars.
As part of this week's RTÉ News special series On The Move: The Future of Transport, Business Correspondent David Murphy reports from London where a little car is making a lot of noise.
Click here to watch his report
RTÉ.ie Extra
Watch this special EU-produced programme about the HyFLEET: CUTE Project for more about Hydrogen-powered transport for the future
Related Links
Transport for London's Electric Vehicle section
Irish dealer for the electric car REVA
