4 of 12 The diesel fleet is the second largest in the UK, behind petrol cars and after diesel vehicles.
In 2012 diesel cars made up 8.9% of UK passenger vehicles.
The fuel cards are designed to encourage motorists to choose low emissions and are often used by the fuel-efficient petrol cars to help reduce CO2 emissions.
The cards can be purchased from any petrol station.
It is not clear how many of the cards have been used on the roads since the cards were introduced, but the Department for Transport estimated that there were over 1.5 million cards in circulation in 2011.
The diesel fleet has been an increasingly popular mode of transport for the past decade, with more than 40% of cars sold in the country being diesel powered.
In 2011, about 20% of all diesel vehicles sold in England and Wales were diesel powered, with about 1.4 million diesel vehicles in use, according to the latest figures from the UK Government’s National Diesel Emissions Inventory.
The Department for Business, Innovation and Skills (BIS) has previously estimated that diesel cars account for about half of all passenger vehicle CO2 reductions in England, with around 20% in London.
The BIS has also estimated that the diesel fleet accounted for around 15% of the CO2 savings that the Government aims to achieve from the Government’s new carbon capture and storage (CCS) scheme.
In March, the Government announced a new strategy to reduce the UK’s emissions of carbon dioxide, the main greenhouse gas from burning fossil fuels.
The UK Government has also committed to cutting greenhouse gas emissions by 40% by 2030 and has committed to reducing CO2 by more than 50% by 2050.
The new policy will see the UK take on its largest CO2 reduction targets to date, from 2021 to 2025.