Professor Ian Walker:

I will not add much because a lot of this has already been said. We need to think about regulating adverts. The key will be to resist the temptation to bring in the industries too much as part of this. We already have issues at European regulation level whereby emissions targets for motor vehicles only include certain parts of the emissions. A car has to be below a certain number of grammes of CO2 per kilometre, but that does not include the embodied energy of getting the oil to you in the first place and things like that. I love the idea of a simple unified metric, like APR in financial circles, that could be used. However, any attempt to come up with such a metric should be derived pretty much exclusively by Government and experts and imposed on fossil fuels and extractive industries. There should be caution about too much consultation.