This report contains a description of environmental policy tools, gives an overview of post-Normal science (bridge between complex systems and environmental policy), ecological economics, the incommensurability principle, the mulitcriteria evaluation and the NAIDE method (fuzzy information).

We have compared three cases of payments for water-related environmental services (PES) in Central America, in terms of socioeconomic background, opportunity costs of forest conservation and stakeholders’ perceptions on the conditions of water resources and other issues. We found that, in...