French cities seem on the verge of banning SUVs to improve pollution. But is banning 4WDs really such a hot strategy to reduce CO2 in the world’s big cities? Where do passenger vehicles really fit in when it comes to greenhouse?

The big French cities say they’re in the process of banning gas-guzzling vehicles – including 4WDs – in an attempt to curb emissions.

The exact scheme to be put in place – exactly which vehicles, in exactly which neighbourhoods, and exactly what penalties could be enacted – are at this stage still unstated. But the intent to proceed with the project has been