Geopolitics focuses on political power linked to geographic space. In particular, territorial waters and land territory in correlation with diplomatic history. Topics of geopolitics include relations between the interests of international political actors focused within an area, a space, or a geographical element, relations which create a geopolitical system. Critical geopolitics deconstructs classical geopolitical theories, by showing their political/ideological functions for great powers. There are some works that discuss the geopolitics of renewable energy.