That 's because pasture grazing is inherently inefficient .

这是因为牧场放牧效率不高。

The key is how grazing animals are managed .

这一问题的关键在与如何看待放牧管理。

But rotational grazing works better in theory than in practice .

不过，循环放牧在理论上比实际上运作得更好。

The american plains , too , would accumulate carbon in their soil if grazing stopped .

美国的平原也是，如果停止放牧，土壤里会积累大量的碳。

Another commonly cited example is violent competition for scarce grazing between nomadic herdsmen in the horn of africa .

另外一个经常被人提起的例子是非洲之角游牧民族对稀有牧场的激烈争抢。