Potash Extraction and Historical Environmental Conflict in the Bages Region (Spain)

Potash extraction in the Bages region (Spain) is the cause of historically significant environmental impacts, such as the salinisation of the Cardener and Llobregat rivers. Recently, several projects that will increase the production of brine and salt tailings in the near future have been announced. Following Martinez-Alier, in this paper I characterize the struggle around potash extraction and its socioenvironmental impacts as an ecological distribution conflict and I argue for a historical approach that brings together the analysis of water, potassium and chlorine flows. Despite the relevance of potassium as an irreplaceable plant nutrient together with phosphorus and nitrogen, research about potash extraction related conflicts remains mostly unaddressed. In this case, archival and statistical sources are used to present potash extraction in the Bages in relation to the increase of water salinity in Barcelona during the 20 th century. I devote special attention to the technological infrastructures developed in order to technically fix the problem of water salinisation, such as the brine collector or reverse osmosis filters, while highlighting the power relations behind the choice of such technologies. The historical approach to this case study shows that Martinez-Alier’s definition of externalities as cost-shifting successes applies to the economic burdens related to the environmental remediation, mostly covered by public budgets.