Reducing the number of cars in our driveway, do the pros outweigh the cons?

Do you actually need two-three cars in your garage? Or your family might easily survive with one car as well? Those of you who currently have two or more than two cars, have you ever thought about sharing a car or downsizing to just one. Many of you who have more than two cars in your family, how much you drive all of your cars. I have seen people who hardly ever drive their second car. It’s usually just sit there for days or even weeks at a time without being used in their garage or parking lots.
There are many upsides of Downsizing to one car and it’s not just all about money. For example, fewer cars means less driving. You’re reducing carbon footprint per family. On an average, one gallon of gas creates 20 pounds of carbon dioxide and the average car emits about 5-6 metric tons of carbon dioxide every year [1,4]. And, in case you own two or more than two cars just imagine the amount of carbon dioxide you’re emitting alone every year with your cars out there.