Font:http://tecnologiaisostenibilitat.cus.upc.edu/continguts
/aigua.-perspectiva-global-i-gestio/4.-usos-de-laigua-industrial-domestic-i-agricola
Imatge: http://images.nationalgeographic.com/wpf/media-live/photos/000/190/cache/fresh-water-pet-food-agriculture_19069_600x450.jpg
