Through encounters with a hydrologist, a farmer and citizens mobilised around the Marais Poitevin, the director helps us understand the effects – on biodiversity and the state of rivers – of substitution reserves, also known as megabassins. For several years, Anne-Morwenn, David, Patrick, Yann and others have been fighting for fair water sharing and devising ways to convince as many people as possible that it is time to change the agricultural model.
