>I would sell it, but then someone else would presumably actually use it. They would use it and reduce the need for carmakers to make a new car. Making a new c

>I would sell it, but then someone else would presumably actually use it. They would use it and reduce the need for carmakers to make a new car. Making a new car emits co2 as well. So unless your car has a bad enough mpg that the better mpg of the new car outweighs the manufacturing co2, it's better for the environment for you to sell your car. Reduce, reuse, recycle.