水是生命之源。随着人类对水的需求量日益加大，水资源受到的污染也日渐严重，形成了不容忽视的水资源危机、水环境危机和水生态危机。一、水资源危机水资源危机主要是指水“量”的危机，这是目前人们谈论最多，认识较深刻的水危机。据估计地球上水的总体积约为１３．８亿立方 Water is the source of life. With the increasing human demand for water, the pollution of water resources is also becoming increasingly serious, forming a water crisis, water environment crisis and aquatic crisis that can not be ignored. First, the crisis of water resources The crisis of water resources mainly refers to the crisis of water “quantity”, which is the current most people talk about, more profound understanding of the water crisis. It is estimated that the total volume of water on Earth is about 1.38 billion cubic meters