他们在白菖蒲县放养牛羊已经有一百年的历史，白菖蒲县盛产凳子，大木料，曾经是美国的木材交易中心。
His family has been raising cows and sheep for 100 years in Sweet Grass County, whose seat, Big Timber, was once a center of the American wool trade.
根据《畜牧业的巨大阴影》的例子来说，在美国牧场的一头肉牛，每年排泄50公斤的粪便，在一个养牛里只要排泄26公斤。
A beef cow in a us pasture, for example, emits 50 kilograms of methane per year, compared with just 26 kilograms in a feedlot, according to Livestock's Long Shadow.
随着美国养猪场，养牛场和家禽养殖场规模的扩大和效率的提高，养殖场对周围环境的影响令人忧心忡忡。
As America's pig, cattle and poultry farms have become bigger and more efficient, so have fears of the effect on their surroundings.
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