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Greenhouse gas emissions running into hundreds of millions of tonnes have not been disclosed by Britain's biggest businesses, masking the full extent of the UK's contribution to global warming, according to a report published in February by Christian Aid. Only 16 of Britain's top 100 listed companies are meeting the government's most elementary reporting guidelines on greenhouse gas emissions. Reports vary enormously between companies, Simon Bowers reports that Marks & Spencer declares 5m tonnes of CO2 emissions, more than twice as much as its larger rival Tesco. The discrepancy is down to the fact that M&S includes its global supply chain and its customers' journeys when calculating its carbon footprint and Tesco does not.

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