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If, for example, in some local area the water table continues to drop and the topsoil to blow away, the land values will disappear with the water and the soil. People on the farms will drift into the nearby cities; the cities will have no farm trade and the workers in the city factories and stores will have no jobs. Property values in the cities will decline.
I can't think of any other reason, except to prevent erosion. In those days scouting was done by cavalry, and from the other side of the river these look like natural grassy banks." Inspection of the embankment disclosed that Rick had guessed right. Scotty inspected the place where the rain had washed the topsoil away, probably because some careless picnicker had ruined the grass in that spot.
The winds came, vicious winds full of dust and sleet and ice, wild erratic twisting gales that ripped the village to shreds, tearing off the topsoil that had been broken and fertilized merciless, never-ending winds that wailed and screamed the planet's protest. The winds drove sand and dirt and ice into the heart of the generators, and the heating units corroded and jammed and went dead.
Humanity has increasingly upset this balance of nature, ignorantly and often stupidly, without pausing to determine the resultant changes. Nowhere is this upset more in evidence than the changes in climate and animal life and their possibilities of survival brought about by the erosion of topsoil. Paul Sears, in his Deserts on the March, has told the story.
Wasted through neglect and careless use, squandered in the senseless destruction of war, the earth is still a rich treasure house for its multitudinous forms of life. Its remaining treasures can be carefully conserved. Such replaceable resources as topsoil, vegetation and water can be husbanded.
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