It is calculated that about 97 % of the water on the planet's surface is concentrated in the oceans. The ice sheets of both poles and the glaciers in the high mountains constitute about 2 %. The 1 % remaining represents the freshwater resources for mankind, and of this limited amount, 95 % is underground.
據統計，地球表面的水 97 % 集中在海洋，兩極冰原及高山冰川又佔了 2 %，其餘不到 1 % 才是人類使用的淡水資源，而在這有限的淡水資源中，又有 95 % 存在地下。