Nick Clegg’s party has unveiled proposals to only allow ultra-low carbon vehicles on UK roads by 2040.
The controversial measures would mean millions of petrol and diesel cars being forbidden.
Only electric vehicles and ultra-efficient hybrid cars would be allowed on UK roads under the Lib Dem plans.
However, petrol and diesel vehicles would still be allowed for freight purposes.
The plans will be voted on by members at the upcoming Lib Dem conference in Glasgow and could become party policy if approved.