monde (1) qualité de l'eau (1) société (humaine) (1) ressources (1) surpêche (1) population (1) habitat (1) aliment (1) poisson (1) énergie (1) écologie (1) dégradation (1) prélèvement (1) biens (1) Ecology (1) Food (1) Will (1) Water quality (1) Water (1) Threats (1) Power resources (1) Power (Mechanics) (1) Population (1) Persons (1) Human beings (1) Learning (1) Hope (1) Growth (1) Force and energy (1) Food (1)