[londons_explore]

I believe most of the credits so far are california credits.

Other countries round the world are designing different CO2 reduction strategies, often without the ability to trade credits.

[sergiosgc]

Fiat-Chrysler was in the past a large purchaser of Tesla CO2 credits. I haven't followed the news, so I don't know if that is still the case. CO2 credits are a thing in Europe, though.

[londons_explore]

CO2 credits in Europe don't apply to private passenger cars - but big places like power stations and steel factories.