Why are French environmentalists protesting against a water reservoir in La Rochelle?

A police officer and five protesters were injured on Saturday when violence erupted during a demonstration in the French grains port of La Rochelle over the use of reservoirs to supply large-scale agriculture, local officials said. For more information William Hilderbrandt interviews Bénédicte Kjaer Khalat, member and jurist at "Notre Affaire à tous" ("Our common interest"), in Paris.