International audience nvironmental problems, because of their transnational nature, require concerted management, within a multilateral framework, in order to find efficient and effective solutions. Awareness of this requirement has been the basis of green diplomacy since the 1970s. Clearly, it has led international actors, under the impetus of the UN and regional and sub-regional organizations, to cooperate for the protection of the environment. The complexity of this cooperation, given the multiple implications (political, security, economic and socio-cultural) of environmental problems, requires States to take into account several factors, internal and external, in adopting their positions. In Cameroon, the situation of the natural environment, in this case the total economic value (TEV) of the forest massif, is an important factor in the country’s engagement in international ecopolitics. The purpose of this article is to show how Cameroon’s action in favor of the international protection of the environment is influenced by its concern to preserve the multiple ecological services provided by its natural environment? The study takes a historical approach, combining a dual qualitative and quantitative focus, and draws on a variety of sources both bibliographic, electronic and field surveys.