Cattle production is one of the first emitters of methane (CH4), this gas with a much more warming effect than carbon dioxide. The fermentation produced by the digestion of cows creates methane that they expel through "burping" and flatulence.
According to the IPCC, methane would be responsible for two-thirds of existing global warming. In France, agriculture is on the front line: 67% of methane emissions are attributable to the sector, 87% of which is attributable to cattle farming alone.