Bentley, Porsche and Rolls Royce sign up to ‘green’ scrappage scheme. The manufacturers of some of the most-polluting cars on British roads, including Bentley, Porsche and Rolls Royce, have today signed up for the government’s scrappage scheme, an initiative described as ‘green’ because it aims to replace older vehicles with new, fuel-efficient models. In theory it means that someone who scraps a 1999 Volkswagen Lupo TDi 3L, (81g CO2/km) and buys a 2009 Bentley Arnage 465g CO2/km) would receive a £1,000 taxpayer-funded payment. The Bentley produces over 5 times as much CO2 as the smaller car!Director at the Environmental Transport Association (