In 1991, Fisk and Vittori – developed "A Conceptual and Contextual Framework (for the City of Austin)"; that – served as the basis – for the formation of the world's first municipal green building program (now – operating as „Austin Energy Green Building“). The cooperative effort – earned the United Nations Earth Summit Award: for Exemplary Public Environmental Initiative, in 1992 (the only United States organization – to receive recognition at the Earth Summit).