Sivens, dans le Tarn, pendant des mois et des mois se sont affrontés les défenseurs d'une nature immuable et les partisans d'un barrage destiné à l'irrigation de quelques parcelles de culture intensive. Un jeune botaniste de 21 ans, Rémi Fraisse, en défendant ses idées, y a laissé la vie, tué par une grenade lancée par un gendarme.
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