In recent years, library researchers, as well as IFLA, have emphasized the responsibility of libraries to promote environmental education, especially in light of the UN's Agenda 2030 and the SDGs. Previous research has focused mainly on ”green” library buildings. There is, however, a knowledge gap concerning which methods libraries can use to encourage environmentally friendly behaviours among their users. Thus, the purpose of this thesis is to investigate which methods libraries use to facilitate environmental literacy, as well as which experiences librarians have regarding this work. The empirical data was collected through interviews with five public librarians involved in a wide array of environmental activities at their respective libraries. The data was then thematically analyzed. The results show that the libraries use many different methods which mainly revolve around promoting connections to nature and one’s surroundings. The study also shows that libraries obtaining ”environmental leadership” can serve to inspire change within their communities. Finally, the underlying conditions for this work are affected by the lack of directives and coordination within the Swedish library sphere.