Depends on the miles. An EV undertakes a new gas car after 20k miles.

There is a point where a new EV, with mined lithium and all, will be more environmentally friendly than a used car that didn't need to be built but burns gas for every mile.

If you live in a sunny area (pv) or a dense hydro area, that point is quite quickly reached.

Whether there's a net lower carbon footprint depends heavily on how much gasoline you burn

However the used EV market is only growing