Do we really have to care about externalities? *sulk*

Oh god I forgot about him, although in this case he's not entirely wrong, sharing a gas-powered car is probably more environmentally-friendly than owning a Tesla car.

Not even. A single Uber car is shared between multiple users during a single day, even if they ride alone. Uber Pool is even more efficient in that regard, of course. Tesla cars just sit in garages or parking waiting for their owner to have a need for them.

What do you mean "shorted"?

What did you mean by "the replacement cycle on them is shortened"?

Yes, but this is better wear than parking wear when it doesn't serve anyone. Sure, individual vehicles last longer but it takes costly real estate on curbs, parkings and garages and still costs a bunch. I'd still bet fewer constantly running vehicles are better for the environment than many occasionally used vehicles, including for commute. The sheer difference of number of trips - around 2 per day for a commuter car compared to around 8 per day in March 2020 before the lockdown for taxis is eating smaller offsets.

Well, they somehow are in the environmental department, at additional costs, like forgoing living wages for drivers for example.