Car Adverts Should Show Emissions

It's an idea from a Labour MP, Colin Challen. He wants a quarter of the space in car ads given over to environmental impact data. It's an idea that makes a lot of sense. How else can we make choices that are truly informed? Car adverts, indeed, all adverts, should be about the costs/benefits of a product, not how an inanimate lump of steel, plastic, cloth and rubber is something you need for sexual and career success.