Over one in four of all new cars sold have emissions below 120gCO2/km and average emissions from new cars sold in Europe fell by 3.4% in 2011 to 136.1 grams of CO2 per kilometre, according to preliminary data from analyst firm Jato Dynamics.

According to Jato, Fiat did best (or the least badly) among 20 best-selling brands, with average emissions of just 118.2gCO2/km, followed by Seat, Citroen and Toyota.

Having recently introduced CO2-related tax, Portugal has the lowest emissions at 112gCO2/km.

Under EU regulation, European car makers have three years to reduce emissions from the entire new car fleet to below 130gCO2/km, a limit that is considered far too weak by environmentalists and they argue that the 95g CO2/km slated for 2020 should be brought forward.
http://www.eta.co.uk/2012/03/14/co2-emissions-cars-fall?utm_campaign=apple+16.3.12&utm_medium=email&utm_source=The+Environmental+Transport+Association