puits (1) Nations Unies (1) développement durable (1) représentation (1) besoin (1) milieu naturel (1) prélèvement (1) Article (1) United Nations (1) Programs (1) Sustainable development (1) Protection (1) Value (1) Solidarity (1) Representative government and representation (1) International cooperation (1) Humanity (1) Grammar, Comparative and general--Article (1) Generations (1) Equity (1) Drawing (1) Article (1) Models (1) International cooperation (1) Protection (1)