This fund originated in 1993 thanks to an agreement between the governments of the United States and El Salvador on the reduction of external debt by nature in order to support sustainable growth and the conservation of natural resources.  The emergence of environmental funds at the global level takes place within the framework of the Earth Summit held in Rio de Janeiro in 1992.

The organization has evolved into an environmental restoration fund, which works in alliance with various national and international organizations, including public entities, companies and cooperators.  

Since its creation, FIAES, together with civil society organizations, has developed projects for the restoration of ecosystems in 3 biosphere reserves, 8 Ramsar sites and 51 protected natural areas.

Together with local actors, it has collaborated with the Ministry of the Environment and Natural Resources (MARN) for the consolidation and strengthening of the system of protected natural areas that includes more than 140 complexes. 

Although natural areas only cover 2 or 3% of Salvadoran territory, FIAES has not only focused on protecting those areas, but also on strengthening projects to restore degraded areas and the sustainable use of natural resources.  

FIAES has become an ally for the country's environmental restoration, by attracting and effectively allocating financial resources to programs and projects, strengthening the capacities of local actors and advocacy on environmental issues.