[bongoman37]

Yeah, blast furnaces aren't exactly carbon neutral.

[Scoundreller]

Cars get recycled though, maybe not to automotive steel grade, but autos are more like metal storage than metal destruction.

[ClumsyPilot]

Metals can be recycled perfectly to space/medical/marine/any grade, they do not degrade like plasics. You can get a collection of metal scraps and produce pure elemental iron if you want