Foundations so essential as the ethics, citizenship, intercultural relationship contribute to education from the youngest age. The new answer to the challenge to transmit these principles and these values consists in associating active young peer-educators within diverse associations with the co-construction of concrete actions in terms of environmental protection, ecocitizenship, protection and promotion of material and immaterial heritages, before opening more widely to all the young people. The text which follows depicts this dynamics established within the framework of an experiment of co-construction of Algerian-French training projects carried by the association of the community centers of the districts of Bordeaux and the Health Sidi El Houari association of Oran.