Granovetter's theory of the strength of weak ties and Ronald Burt's concept of structural holes are two best known theoretical contributions of this field.EnvironmentEnvironmental sociology is the study of human interactions with the natural environment, typically emphasizing human dimensions of environmental problems, social impacts of those problems, and efforts to resolve them.. 
Shelton Jackson "Keke" Lee (Ọjọ́ìbí March 20, 1957) jẹ́ ọmọ Amẹ́ríkà olùdarí fíú, atọ́kùn, Olukọwe eré fífí, àti Òṣèrépọndandan ara fí Aramíràn Ara Amẹ́ríkà Kan Tuntun..