Eroding Soils Darkening Our Future - by Lester R. Brown

In 1938 Walter Lowdermilk, a senior official in the Soil Conservation Service of the U.S. Department of Agriculture, traveled abroad to look at lands that had been cultivated for thousands of years, seeking to learn how these older civilizations had coped with soil erosion.  He found that some had managed their land well, maintaining its fertility over long stretches of history, and were thriving.  Others had failed to do so and left only remnants of their illustrious pasts.

Eroding Soils Darkening Our Future -- by Lester R. Brown