Future carbon trading

Carbon trading for individuals?

'Imagine … it is 2015, and you are buying fuel for your hybrid car.
You go to pay, and are told that your purchase will cost £100, plus 50 carbon credits.
Thankfully, you have just received your regular top-up of free carbon credits into your online carbon account, which already has a healthy balance due to your low carbon consumption. So you hand over your carbon ID card, and the credits are electronically taken from your account in real-time. This saves you having to buy the units at the point of sale, which at current market prices would cost you £25.'

I found this scenario on the website of the Sustainable Development Commission, an independent advisory body to the UK government. Although a few months old (placed on the site in September) this is a still the subject of lively debate on the SDC website, which is also a very valuable source of ideas and information on sustainable development.

What do you think? Is this the way forward? Will this encourage individual responsibility or is it a recipe for massive bureaucracy and corruption?