What if you sell your carbon allocation to buy lots of beans?
http://www.smh.com.au/news/world/carbon-rations-for-consumers/2006/07/19/1153166454930.html
Carbon rations for consumers
Britain is devising a plan to curb greenhouse gas emissions by rationing individuals' carbon use.
The scheme could force people to carry a swipe card that records their carbon allocation, with points knocked off each time they buy petrol or air tickets.
Under the scheme, citizens from the Queen down would be allocated an identical annual carbon allowance, stored as points on an electronic card similar to air miles schemes or supermarket loyalty cards.
Points would be deducted at point of sale for every purchase of non-renewable energy. People who did not use their full allocation, such as families who do not own a car, would be able to sell their surplus carbon points into a central bank.
High energy users could then buy the points. Motorists who had used their allocation would still be able to buy petrol, with the carbon points drawn from the bank and the cost added to their fuel bills.