National Geographic : 1976 Jul
JIM BRANDENB Dust bowl in the making? Forgetting the hard lessons of the past, some midwestern farmers are cutting down trees that served as windbreaks, and plowing more land to increase crops and hence profits. Wind breaks like these on a North Dakota farm (left) were widely planted after the 1930's dust bowl days. Now the land may once more be blowing away. Layered snow and blown top soil-"snirt"-(above) collect along a Minnesota roadside. When the snow melts, the dust may fly again-and with it the land's fertility. A biologist (right)shows how parched top soil is easily gone with the wind.