Electric cars are the future in Government-backed scheme.
A Smart-sized hydrogen city car called the Riversimple Urban Car will be revealed next week.
Lamborghini will add green tech to its cars to try to cut its carbon dioxide emissions by 35% by 2015.
A fifth of Britain's 34 million motorists plan to buy an electric car within the next five years.
The number of people converting their cars to run on liquid gas has risen by more than a third.
Emissions targets cannot be met by solely investing in electric cars, says a new report.