In what is likely the world's most aggressive action against SUV's, London mayor Ken Livingstone has unveiled plans to charge the highest polluting vehicles £25 per day to drive in the central city. Meanwhile, cars with the lowest emissions, including electric vehicles and hybrids would receive a 100% exemption.

Mr Livingstone said they would have three years to trade their cars in for less polluting vehicles, and those considering the purchase of a Band G (high emission) vehicle should consider the additional cost.

The move is both correct and visionary for placing the costs of carbon emissions where they belong - on the consumers who choose polluting vehicles over efficient one.