Listen to all that glorious engine noise. Beautiful isn't it? Now, what if we told you that all of it was carbon-neutral? You'd be right to doubt us – you’re looking at a couple of petrol-guzzling supercars hooning around the Top Gear Test Track. However, these are running on synthetic fuels, which when burned, emit only the CO2 that was extracted to make them in the first place. Still confused? Allow Chris and Paddy to be your guides...

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