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In case you get your green wheel options mixed up, here are some simple definitions starting, of course, with our favourite option.

Electric vehicle – a vehicle driven entirely by an electric motor powered by a rechargeable battery that is usually plugged in overnight

Hybrid – a vehicle containing both an electric motor that recharges itself from kinetic energy and a petrol-powered internal combustion engine

Plug-in hybrid – a hybrid that can be plugged in to an electrical outlet to charge its battery

Flexible-fuel vehicle – a vehicle that can run on a blend of petrol and alternative fuels, usually ethanol

Ethanol-powered vehicle – a fuel that burns cleaner than gasoline and usually is produced from grains like corn, wheat and barley

Biodiesel vehicle – usually a mixture of conventional diesel fuel with renewable resources like soya bean or rape seed oil or waste animal fat

Hydrogen-fuelled – this element can power fuel cells and is touted by some as the zero-emission fuel of the future, though it faces technical and distribution obstacles