Research on Evolution Characteristics and Factors of Nordic Green Patent Citation Network

Dealing with the environmental and climate risks caused by global warming has become a consensus. As sensitive area particularly fragile ecological environment, Nordic countries took lead in making commitment of “carbon neutrality” middle this century. The green industry will play an important role during process. Based on patent data related to countries, paper studies evolution characteristics dynamic changes influencing factors citation network from 1980 2019 using social analysis method exponential random graph model. research results show that: technologies have gradually changed passive development active innovation source, diversified subdivided process; connectivity transitivity are good relatively stable connections non-Nordic strong spread distant regions; awareness property rights protection increased, academia increasingly integrated, which all promote formation relationship.