Several UN documents have identified climate trends as a security concern in recent years. A remarkable development can be seen in the incorporation by the UN of the climate change issue within its security dimension, through the unanimous adoption of recent UNSC resolutions. But what is the extent of the UNSC commitment to address intercommunal conflicts exacerbated by climate related effects in the Sahel region? What are the legal and practical implications of the UNSC recommendations for the UN and its subsidiary bodies in areas characterized by generalized State weaknesses and weak enforcement of the rule of law? Has the UNSC really succeeded in ensuring an adequate integrated approach to multidimensional threats in the Sahel? The present contribution tries to answer these questions by analyzing selected provisions of UNSC Resolution 2423 (2018), concerning the situation in Mali, and their implementation. In a tentative conclusion, a few reflections will be developed on the possible impact of the UNSC approach to climate security threats in the Sahel on the evolution of the UN system of collective security: new wine in old bottles or a first step towards a change in the overall security architecture of the Organization?