A pungent odor like turpentine wafts over the hillsides north of the Mongolian capital. It comes from the sharilj, a wild plant that has taken over the scalloped landscape, a telltale sign of overgrazing since the plant is inedible for sheep and goats.

Sukhtseren Sharav has a herd of 150 goats and 100 sheep, and as they chew their way through everything else, and the sharilj spreads, he must shepherd them ever higher into the mountains to find fresh grazing land.

Read more (The New York Times)