The red muds and dusts released by the production of specialty alumina from Altéo-Gardanne (southeast France) has been the subject of numerous mobilizations since 2014. They follow the positive and conditional advice given by the young Calanques National Park to continue discharging bauxite into its marine core area. This paper proposes an analysis of these mobilizations, based on a sociological survey (2015-19) conducted among their main stakeholders : the collective for the Calanques protection, fishermen, ecological collective, or Altéo-Gardanne and Mange-Garri landfill residents’ organizations. The analysis of their discourses makes possible to identify several problem definitions or "framing", which reflect different experiences of environmental and health damage, and divergent world views (including about technology). Furthermore, these discourses borrow from registers related to Environmental Justice, without explicitly referring to it. The parallel with the US founding mobilizations of this wide movement contributes to question the dynamics of the anti-discharges of bauxite front, the diversity of its participants and resources, as well as the main elements that curtail or, rather, foster the convergence of the "land" cause and the "sea" cause.