Answer:it depends
Explanation: sustainability of what?
A country? A company?
As long as we maintain anything economically and or socially 
 
        
             
        
        
        
17-1800's 
I know that James Hutton is considered a father of modern geology and he was born during some where in the 1720's so that's the closest answer, also Charles Lydel was born during the late 1790's. 
        
             
        
        
        
Explanation:
Ecosystems exist at a range of scales and involve the interaction between biotic and abiotic components. An example of a small scale UK ecosystem to illustrate the concept of interrelationships within a natural system, an understanding of producers, consumers, decomposers, food chain, food web and nutrient cycling.