>You can say that pretty much about any personal items -- laptop, phone, clothes, shoes, even your house. Manufacturing them cause harm to the environment and they're idle most of the time. Some of your clothes may stay unused for years, or forever. Yet nobody advocates for sharing them. That's because they are personal, reflect the owner's personality, and they're there when you need them.

This is just false. T shirts and shoes do not cause the same level of harm to the environment as manufacturing a car. It seems to me you don't understand what goes into mining, refining, processing all of the parts that go into making a car. You also don't seem to understand how progress happens - incrementally - by tackling the big-ticket items first. Good luck with your anti-public transport argument, you haven't convinced me.