Since the eighteenth century, the environmental and climatic issues that run on the current department of Val-de-Marne have not ceased to renew themselves to the grés of the geographical, economic, technological and urban changes of society. With regard to current issues, the second part of the exhibition “+2°? Les Val-de-Marnais, le climat et l'environnement (1945-2015)» intends to shed historical light on these ball-payments through various works from public or private collections.