Driving takes a big bite out of your budget and your time. Carpooling saves money and reduces congestion on our roads and  highways. It also gives you the opportunity to develop new friendships with co-workers or other commuters. There are a number of benefits when two or more people share a ride in one vehicle. According to the website http://drivelesssavemore.com/carpooling-benefits there are a lot of benefits of carpooling:
1."Carpooling can save you hundreds and even thousands of dollars a year as it reduces the costs involved in repetitive or long-distance driving.
It reduces the stress of your commute and allows you to read, relax, or even work while commuting."
2."Carpooling enables some families to cut back to one car or to do without a car at all."
3."If you don’t have a car or don’t drive, carpooling allows you to consider jobs throughout the area."
4."Carpooling can provide you with new friendships and company for your commute."
5."Carpooling reduces air pollution and traffic congestion, something that benefits all of us!"
6."Carpooling helps to combat rising  traffic congestion, by filling the extra seats in your car, there are fewer drivers, and therefore fewer cars crowding the roads."
Let me know if you have already shared your car with other people and if you did just tell me if you have enjoyed or not the experience.

I agree with you. In fact, I recently wrote a post similar to yours!
It is true that carpooling reduces air pollution, but it is much more than that. Cars release carbon dioxide which, if too excessive, can become harmful to the environment. In a 2013 study made in the UK, 26% of all UK greenhouse gas emissions were the effect of domestic and international transport. That's a lot of greenhouse gases!
So while it is true that carpooling reduces congestion in roads and highways, it can also be a major improvement to our ecosystem.

SOURCES:
http://www.dft.gov.uk/vca/fcb/cars-and- … ioxide.asp