Without question, the invention of the car was one of mankind's greatest achievements. It's allowed us to reach heights never before imagined. Now they're not looked at as fondly as they were before, because of how much further we've come with transpiration. A big problem is that most cars still run on oil, and that entire process is destroying our environment. While some are debating the benefits of driverless cars, others across the world thought about no cars at all. Then they put that into practice. From Bogota to Paris, Detroit to Istanbul, cities around the world imposed traffic restrictions to mark World Car-Free Day. Could this be the future?