Studying climate change requires taking into consideration multiple factors that influence it. Finding and understanding the degree of importance of these factors as well as their interinfluences could provide indicators on how to apply these principles among others in growing metropolitan cities. Public, semi-public & private actors (research laboratories, government agencies, etc.), associations, NGOs, mobilize and participate in new discoveries in related fields and experiment; some of them involve citizens (Smart Cities, Enoll, Triple Helix, etc.). French Metropolitan Cities have developed their PCETs program (Territorial Climate and Energy Plan) to meet the objectives set by the European Union for 2020 and the National Climate Plan, set out in the Grenelle I and Grenelle II laws in France. In 2007, as part of its Climate Energy Plan, the Lyon metropolitan area made a commitment to reduce CO2 emissions by 20% by 2020 (75% by 2050), to cut energy consumption by 20% and to consume 20% of renewable energies. This article propose defining and initiate a knowledge base on climate change starting from WEEE (waste electrical and electronic equipment) in large Metropolitan cities such as Metropole of Lyon and Metropole of Montpellier. This Knowledge base will contain best (and bad) practices, experiences, suited metrics, collaborative measures, projects, etc., using the Knowledge Management approach exploring artificial intelligence techniques. For our methodology we work on the state of the art for building such a knowledge base, taking into account the works of D. Boulanger (2005), E. Mercier-Laurent (2015, 2018) or G. Kayakutlu & E. Mercier-Laurent (2016) on that particular field, and we begin to list existing materials in order to implement in a near future a little knowledge base, on the recycling of products, particularly electronic products for these metropolitan cities.