On the 26th of September, the FDA organized a citizens' debate in the Parc Montsouris with Météo France and the Agence Parisienne du Climat. 

In preparation for the COP21, the debate centered on environnemental issues: "This House refuses to sacrifice its comfort to save the climate". For the very first time, the debate was held in French and members of the public were invited to express their views about the subject. 

Omar Layachi (Polytechnique), Pierre Brunstein (Paris II), and Elie Ziade (Paris I) carried the motion against fierce debaters from the Fédération francophone de débat.