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Late 1700's Antoine Lavoisier, a chemist, discovered Oxygen and Carbon…

- - - - 1940's Ruth Patrick studied the interdependence of organisms, particularly freshwater ecosystems. She developed methods to measure the health of a stream
        
        1950's People first become aware of the harmful effects of pollution on ecological systems and on people.
        
        1953 Eugene Odum, Howard Odum wrote the first ecology textbook and ecology becomes a university course.
        
        1972 Acid rain effects on lakes is discovered and studied by Harold Harvey
        
        1978 Conservation Biology established as a discipline focusing on environmental management
        
        1980's
        
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