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the United States there is not sufficient information to decide 

 whether there is no ecological damage, or whether there is just no 

 easily identifiable pollution problem present. 



The complex nature of pollution in the estuarine zone prevents the 

 separation of sources of pollution, kinds of pollution, and types 

 of environmental damage into neat compartments of cause and effect. 

 All of human activities in the estuarine zone can damage the environ- 

 ment and most of them do. 



Unerever people live, work, and play in the estuarine zone the 

 demands of their social and economic activities place stresses on 

 the biophysical environment. These stresses frequently result in 

 degradation of that environment, perhaps not immediately or even in 

 a few years, but nonetheless certain in its devastating final impact. 



