I’ve finally solved it.
We’re using too much petrol because we’re driving everywhere. The solution is to replace all of the main roads with giant conveyor belts. You drive on to them, turn your car off and let them take you to your destination. If you need to get off, you just turn your car on and drive off.
As an added bonus the streets which aren’t conveyor belts will be made so that they are all downhill. You simply coast down them without having to start your car.
Some people may point out that the giant conveyor belts will need power. Not to worry, we get everyone who is overweight and sit them on exercise bikes which are connected to the belts. As they pedal the belts turn round. Eventually the overweight people lose weight, so I’ve also just solved the obesity epidemic.
