So I then began looking at all the research plots I could over the whole of the Western United States where cattle had been removed to prove that it would stop desertification, but I found the opposite, as we see on this research station, where this grassland that was green in 1961, by 2002 had changed to that situation.
于是我开始收集和分析 我能找到的整个美国西部 所有的研究站的数据 那些地方的牛群都被移走了 来证明这样会停止荒漠化， 可是我发现的却相反， 看这个研究站， 在1961年这片草地是绿的， 到2002年变成这种状况。