Car manufacturers must hit the target on a sliding scale:
The 130g/km figure is roughly equivalent to achieving 58mpg in a diesel-powered car, and 52mpg in a petrol model.
Manufacturers that fail to meet the targets will be fined.
Niche manufacturers that produce between 10,000-300,000 units a year will be expected to deliver a 25% reduction on their 2007 average emissions by 2015. Small volume manufacturers that produce less than 10,000 models per year will have separate targets.
These figures mean that Jaguar, Land Rover and Aston Martin are counted as small and niche manufacturers.