We will be comparing the best-selling electric vehicle, the Nissan LEAF, against the first hydrogen-powered car, a fuel-cell version of Hyundai's ix35 SUV.
The COP21 Conference signals the beginning of the end for the internal combustion engine that powers almost all cars today.
The EU has pledged to cut carbon dioxide emissions by at least 40% over the next 15 years - impossible to achieve with petrol and diesel vehicles.
Technology correspondent Tom Cheshire will drive the electric LEAF from Sky's studios in west London.
But the 270 mile journey is beyond the range of the car's battery.
It's likely he will have to plug in to a recharging point two or even three times, each stop adding at least 30 minutes to his time.
Science correspondent Thomas Moore will drive the hydrogen ix35.
He will have the advantage of a three-minute refuelling time and a theoretical range that puts Paris within reach.
But a hydrogen filling point at Heathrow is his only chance to take on gas. The current lack of a fuelling stations means that if he runs out he will be stranded.
also have to take the cross-Channel ferry. Gas-powered cars are banned in the tunnel even though experts say the hydrogen fuel is as safe, if not safer, than petrol.
That should put Tom in his electric car ahead at the half-way point in Calais.
Tom said: "Electric is the established technology; everyone from Silicon Valley start-ups to 100-year old car companies are betting on it.
"Batteries get better and charging stations are proliferating over Europe. That means we avoid range anxiety and can get on with the driving.
"Also, I'm a fantastic driver, reminiscent of a young Damon Hill."
Thomas is confident that his hydrogen vehicle will get to Paris first.
"Hydrogen fuel cells are no longer just found in concept cars at trade shows.
"They're now a reality, combining the range of a petrol car with the emissions-free driving of an electric.
"Crack the refuelling problem and what's not to like?"
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