Cows produce beef, milk — and a lot of methane.
A byproduct of digestion, methane is produced from both ends of the animals, although over 90% enters the atmosphere via their burps.
And that’s a problem, because methane is a potent greenhouse gas, which traps 28 times more heat than carbon dioxide over 100 years.
As the world’s appetite for beef has grown over the last two decades, annual methane emissions have risen 9% a year. According to the FAO, cattle are responsible for nearly 10% of greenhouse gases generated worldwide by human activity.