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.
Next time you are at the grocery store, make sure you look for local and organic food.
Source: New Scientist