Statistics from the Society of Motor Manufacturers and Traders (SMMT) and Clean Green Cars has revealed that the six months preceding June saw a 3.18 per cent reduction in emissions.This represents the largest CO2 drop on record, with the last significant decrease being recorded in 2000 at 2.2 per cent.Paul Everitt, chief executive of SMMT, commented that progress could be built on by improving re-fuelling infrastructure and consumer information, as well as increasing incentives for greener driving.He said: "[The] figures are further evidence of the progress car makers have made in cutting CO2 from new models. "The reductions are significant and sustained and will increase as more fuel-efficient cars come to market."Imperial College London research cited in the Guardian suggests that every ten per cent increase in fuel prices correlates with a three per cent decrease in road traffic.