ENSAI composition d anglais 2004 eco composition d'anglais economie

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J. 0854JN 7JTUT NATIONAL DE LA STATISTIQUE ET DES ÉTUDES ÉCONOMIQUESECOLE NATIONALE DE LA STATISTIQUEET DE LNALYSE DE LNFORMATIONconcours dlève titulaire de lNSAIconcours dttaché de lNSEEMAI 2004SPECIALITE ECONOMIEcomposition dnglaisDurée : 2 heuresLe sujet comprend 2 pages (y compris celle-ci).Sans dictionnaireTournez la page S.V.P.– 2 –PRICELESSWater is by far the commonest substance on earth, but 97% of the total is seawater,unfit for humanuse. Of the 3% that is fresh, two-thirds is locked up in glaciers or ice and snow around the poles. Only 1% ofail the world's water is available for human consumption. Water is literally vital: without it, life could notexist. But even 1% of the earth's available water should be enough for ail. Unlike oil or coal, water isinfinitely renewable.Yet two big obstacles stand in the way of delivery of water to people. The first is that it is often inthe wrong location. Some places have more water than they can possibly use; others have too little. In manyparts of the world, such as India and Bangladesh, rainfall is highly seasonal: almost ail the year's supply mayarrive within a few months. There are variations even at local levels, as is the case with two villages 20 milesapart in Tanzania. Water is also heavy, which makes it costly to transport over long distances.The second, bigger difficulty with water is, however, neither physical nor geographical: man'sextravagantly wasteful misuse of it. This stems largely ...

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