It may surprise you to learn that our diets account for up to twice as many greenhouse emissions as driving. One recent study suggested that the average US household’s annual carbon food-print is 8.1 tonnes of “equivalent CO₂ emissions” or CO₂eq (a measure that incorporates any other greenhouse gases produced alongside the CO₂). That’s almost twice the 4.4 tonnes of CO₂eq emitted by driving a 25-mile-per-US gallon (9 litres per 100 kilometres) vehicle 19,000 km – a typical year’s mileage in the US.

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