Do you live in a city and need a car? Instead of driving your own car or hiring a car, join a car sharing club! 
This is an effective way of reducing the traffic, and help reduce the pollution. You can use an app to see where the available cars are parked and use them. 
Of course, if you have the choice, prefer public transport! But if for any reason you do need a car for the day, car share! 😉 Easy!