As the source of life, water is indispensable (不可缺少的) to human beings. People consume much water in production and daily life. Agriculture and industry account for most of mankind’s water usage. Without adequate water supplies, human future is threatened.

Nowadays water shortages touch a large percentage of world population. According to one UN study in 1999, nearly one in five people lacks safemclean waterg WaterWelated diseases in some areas are killing people. Population explosion and water pollution make water crisis increasingly urgent. Water related problems are likely to worsen in the foreseeable future. From joozone.com.

The situation is really alarming (令人震惊的). Therefore, immediate and effective measures must be taken to protect and exploit water resources. Remember, where there is water, there is life. If we could not make proper use of water resources on earth, the last drop of water would be our teardrop.
核心剖析
本文根据需要，并未使用冗长或过于复杂的句子，意思明白无误，行文层次清晰，表达干脆利落而不落俗套。

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