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Etape 1 (Eau potable): http://sciencepasteur.pbworks.com/w/page/47743654/La%20pollution%20et%20l%27eau%20potable
Etape 2 (Deforestation): http://sciencepasteur.pbworks.com/w/page/51063039/La%20d%C3%A9forestation%20partout%20dans%20le%20monde