威尼斯环境问题的介绍，哪位高手知道啊？最好还是英文的哦！还要有是什么原因造成，小女子先谢过了。。。

Sinking of Venice
High water in Venice
High water in Venice
Venice and surroundings in false color, from TERRA satellite. The picture is oriented with North at the top
Venice and surroundings in false color, from TERRA satellite. The picture is oriented with North at the top

The buildings of Venice are constructed on closely spaced wood piles, which were imported from the mainland. (Under water, in the absence of oxygen, wood does not decay.) The piles penetrate alternating layers of clay and sand. Wood for piles was cut in the most western part of today's Slovenia, resulting in the barren land in a region today called Kras, and in two regions of Croatia, Lika and Gorski kotar (resulting in the barren slopes of Velebit). Most of these piles are still intact after centuries of submersion. The foundations rest on the piles, and buildings of brick or stone sit above these footings. The buildings are often threatened by flood tides pushing in from the