But a study by French scientists published this year warned that flatulent farm animals must shoulder some of the blame.
There are 1.4 billion cows worldwide, each producing 500 litres of methane a day and accounting for 14% of all emissions of the gas.
Carbon dioxide is by far the biggest contributor to climate change, but methane has 23 times the warming potential of CO2 so reducing its emission is also considered important.
Sure, it is a French study, but discounting that, surely there must be a way to pipe that methane into a storage facility and then pump into cars.
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