1-3 



There is first the natural eco- 

 system, a dynamic biophysical 

 environment of land, water, and 

 life, which follows a steady 

 evolutionary pattern of its own, 

 except when man has changed it. 

 Its elements taken together com- 

 prise the total ecology of the 

 estuary. 



The second is the socio-economic 

 environment , the user's world, a 

 system of social and economic 

 pressures directed toward exploit- 

 ation of the natural environment, 

 either by ignoring what happens 

 to it, modifying it deliberately, 

 or using it in its natural state. 



Thirdly, there is the institu- 

 tional environment . This is the 

 realm of law, a system composed 

 of those devices man has created 

 in the form of law and organiza- 

 tion to regulate his activities. 



