Porsche unveiled a futuristic hybrid supercar this week that it claims can hit 100km/h in just 3.2 seconds while emitting just a tiny fraction of the carbon put out by most sports cars.

The 918 Spyder prototype is the German carmaker’s offering to the growing market for hybrid cars that combine an internal combustion engine with electric propulsion, dramatically slashing the amount of greenhouse gasses the car emits.
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