Sky News 
Thursday, Oct 1st, 2009
A local authority in London has become the first in the world to charge motorists for parking on the basis of how “green” their vehicle is.
Richmond upon Thames is to charge drivers varying prices based on the carbon dioxide emissions of their vehicle of choice.
The system works for drivers who use the RingGo system to pay for their parking.
Motorists register and pay by phone, and RingGo accesses the DVLA database for each customer’s registration to determine emissions data on the car.