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Lord Smith of Finsbury believes that implementing individual carbon allowances for every person will be the most effective way of meeting the targets for cutting greenhouse gas emissions.

It would involve people being issued with a unique number which they would hand over when purchasing products that contribute to their carbon footprint, such as fuel, airline tickets and electricity.

Under the Climate Change Act, Britain is obliged to cut its emissions by 80 per cent on 1990 levels by 2050. This means annual CO2 emissions per person will have to fall from about 9 tonnes to only 2 tonnes.

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