106 



OUR USE OF THE LAND 



Anyone who has studied geology will say, "Very well, why 

 get so excited about that? After all that process has been going 



THE YEARLY BALANCE 



OF CROP AND PASTURE SOILS 



ANNUAL 

 GAIN 



TOTAL RESOURCES 



ANNUAL 

 LOSS 



nCTOMAL STATISTICS. INC II 



Each cube represents 100 million tons of plant nutrients 



Each year we ta\e from the soil a much larger percentage of plant food than we 

 put bac\. If we continue to overdraw this capital resource, the result will be soil 

 bankruptcy. 



on ever since there was water on the earth." Quite right. But 

 geologic erosion in the United States accounts for the removal 



