In many big cities you have to pay to park, imagine if you had to pay based on how much Co2 your car pumped out. Sounds like a great way to make people understand how their choice of automobile effects the rest of us. Well wonder no more because in London they are giving it a shot. With a graduated scale based on how big your cars engine is, the parking fees range from $0 for a Honda Insight, and $588 for a Porsche 911 Carrera coupe (many are not aware that high performance cars have some of the highest emissions and lowest gas mileage).
From here
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Owners of Honda Insight gasoline-electric powered vehicles would pay nothing for a parking permit. Vehicles with the largest engines, would pay 300 pounds a year. These include Jaguar X type 2.0-liter gasoline sedan, a Porsche 911 Carrera coupe with a 3.6- liter engine, a 2-liter gasoline Renault Espace and a Range Rover with a 4.4-liter engine, according to the examples given by the council.