My local council kindly takes away all my paper, glass, metal and plastic for recycling. However I always keep the aluminium back and recycle that myself. At Tescos they have a machine that gives you clubcard points for each alu can se we save ours up and take them there. Today, as well as telling us we had inserted 134 cans worth 77 points (Worth £2.31 towards a holiday) the machine told us that by doing this we had sae 19.2kg of carbon dioxide entering the atmosphere. Now regardless of your views on Carbon Dioxide (I personally think GW is down to Sunspot activity) this is a staggering statistic that to manufacture 134 cans from virgin material will produce 19.2kg of CO2 over and above that used to recycle the can. I estimate that the total mass of the cans was about 2kg. In science we have to teach about atom economy in reactions. There must be a serious inefficiency in atom economy in the combined reactions required to produce this material. Mostly in energy production I would think.