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Diesels became popular in the UK for their supposed carbon efficiencies. However, this benefit is marginal because whilst diesel cars do a few more miles to the gallon, a gallon of diesel also has about 20% more carbon in it.

In the UK 40,0007 people a year die prematurely from air pollution, and vehicles cause 8,900 of those deaths. That is five times more than the 1,775 who died in road traffic accidents.

'In an underdeveloped country don't drink the water. In a developed country don't breathe the air.' Jonathan Raban