This paper by Abelardo Brenes and Deborah Du Nann Winter describes the psychological potential of the Earth Charter, a document written primarily by and for non-government organizations and world citizens, for soliciting committed environmental action from people throughout the world.

Abelardo Brenes from the University for Peace, Costa Rica
and Institute for Psychological Research, University of Costa Rica
and Deborah Du Nann Winter from the Whitman College, U.S.A.