The BMW Hydrogen 7, for example, uses 254 kWh per 100 km, but the average fossil car in Europe uses 80 kWh per 100 km.
CNN: Commentary: Let's get real about alternative energy
Finally, Declan looked at the BMW Hydrogen 7 - its only emission is water vapour but the technology for this type of green car is still being developed and currently, there are no models on sale.
BBC: NEWS | Programmes | Breakfast | Low carbon family: "Green" cars
This week it unveiled a prototype version of its 7-Series saloon car that has a hydrogen-powered engine.
ECONOMIST: Hydrogen-powered cars
And in Detroit, BMW will showcase its 750hL, a large, 7-Series sedan with a nearly conventional V-12 motor powered by compressed hydrogen.
FORBES: The Hybrids Are Coming
The highly toxic H2S (hydrogen sulfide) and CO2 (carbon dioxide) are removed along with excess water to get the gas below 7 ppm (parts per million).
FORBES: We're Headed To $8 Natural Gas
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