His method had already been presented as exemplary in a preparatory report[16] for the 1992 Earth Summit, and in 1994 in the Biodiversity congress of the UNESCO in Paris. The method was also presented in 1991 at the Symposium of the University of Bonn, "restoration of tropical forest ecosystems " and at the congresses of the International Association for Ecology, the International Society for Vegetation Science, and the International Botanical Congress, including new aspects including the links between growth, natural habitat and estimated carbon fixation.