The Critical Environment 



II 



U. S. Forest Service 



Fig. 1.6. Advanced degree of land destruction near Leadville, Colorado, where 



forest has been ruined by clear-cutting, and the complete removal of trees has 



resulted in gullying and serious soil erosion. 



U. S. Siiil C.ouscrvnlion Service 



Fig. 1.7. Soil erosion and consequent farm abandonment in Oklahoma, shovi'ing 



disastrous economic and sociological effects of agricultural practices carried on 



without regard to the ecological limitations of the region. 



