The idea for our project was born in Saint-Denis: 134 nationalities, young (40% under 25), strongly impacted by the economic crisis (22.5% of working people are unemployed, 50% of households live under the poverty threshold, the median fiscal income amounts to €11,980 against 21,791 in Fr). This territory is going through a social crisis (40% of those over 15 without a diploma), and democratic (52.45% abstention in municipal elections in 2014). The rate of villainous violence is also high (12.97% against 6.3 for the IDF region). Faced with climate challenges, this territory, like all our European urban territories, has the potential to be innovative and inclusive in terms of ecology. Environmental policies are currently insufficient to build a common narrative integrating all citizens. This challenge can only be met if the population feels they belong to their territory, are concerned by the projects of the territory and therefore in other words, if the environmental issues really become common to all inhabitants no matter their background.