Nation: Ed Moore's ranch sits on the flatlands of the Texas panhandle, east of Lubbock, just outside the tiny town of Ralls. On a clear day, you can see for miles in any direction. Most days, however, the dust blows--and when it does, the sky becomes a dull orange haze and the scene becomes impressionistic. The high gray towers of grain elevators dot the landscape. Cattle graze in silhouette. Farmers ride through the gloom on tractors with vast "sand fighters' that gather the earth into big clods so the...