2025: Norway
2030 EU: Sweden, Netherlands, Ireland, Denmark
2030 Non-EU: India, Israel
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If you take a lifetime of 20+ years for new vehicles into account, and you want to be phased out by 2050, you need to ban in 2030. Very simple. Maybe you don't need a full ban, maybe strong incentives suffice (see China). But full bans have been enacted in law in very substantial markets already.