Whether cattle are reared organically or with conventional farming methods, the end effect is bad for the environment, according to a new German consumer report. The agricultural lobby, however, is preventing politicians from tackling this massive source of greenhouse gas emissions.

 A cow being measured for emissions. Cattle may be gentle creatures but farming them is contributing to climate change, says consumer group Foodwatch. For most people, it's the very picture of rural bliss, of a life in tune with nature and the wholesome world of farming: the happy cow standing on a lush meadow, calmly chewing its cud, a calf at its side.

But for Thilo Bode, the sight of this gentle-eyed creature is everything but reassuring. Bode, the head of German consumer protection organization Foodwatch, warns: "The cow is a climate bomb."

Whether they are raised conventionally or organically, one thing cows have in common is that they burp and fart to their hearts' content. Like all ruminants, cows are constantly emitting methane -- a greenhouse gas that is 23 times more powerful than carbon dioxide -- from both ends. As malodorous as pigs may be, it is the gaseous emissions of billions of cattle, goats and sheep that are contributing to global warming.