Every year since his father's death, Meyer has taken a road trip. But nothing quite as extensive the one he is about to begin.

梅耶自父亲去世后每年都会进行一次公路旅行，但是都不像他即将开始的这场旅行这样广泛。

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Where there used to be nothing but desert, he says, there is now not just grass but shrubs and acacia trees--and he has the photos from 30 years of extensive field study to prove it.

过去这里只有沙漠，他说，可现在这里不仅有草地，还有灌木和金合欢——他有大量30多年从事这方面研究的照片作证。“牧民们把骆驼带到他们以前从来没有见过的如此丰茂的草场上吃草。

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