Educación y comunicación para el cambio climatico. Un punto de vista critico de los obstaculos y resistencias - Climate change has become a recurring issue not only in media, but also in common citizens’ daily life. Several phenomena - shortage and consequent high cost of food, increased vulnerability of coastal areas, desertification, etc - are ascribed to its effects. The public and political interest around climate change has reinforced the importance of environment in the national and international agenda after the silence followed to the Rio '92 Conference. Climate change presents extreme epistemological complexity because it condenses the multiple contents that scientific disciplines use to keep separated. It also calls for a new definition of environmental literacy: not a simple acquisition of information about the environment, but a process lean on a political and ethical substratum, and on a critical social practice, referring to the idea of citizenship.