Translate the following English sentence to French:
"With regard to one of the most controversial points of our debate, the application of tariffs, the Spanish Socialists have been arguing, in accordance with the principle that the polluter should pay, that the directive should propose policies on accessible prices for all levels of consumption."
En ce qui concerne un des points les plus controversés de notre débat, celui de la tarification, nous, les socialistes espagnols, en partant du principe du pollueur-payeur, plaidons pour que la directive défende des politiques de prix accessibles pour tous les niveaux de consommation.