一篇关于水来之不易英语报告报告体现水的循环过程好到我们家成为饮水的过程.并说明"水来之不易"

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World Resources Institute,a report shows.5.3 billion people on Earth,34 million people in an average of only 50 liters of water per person per day:not only water in arid areas,even in districts with more rainfall.Also because of contamination,so that water falling.A United Nations report said.The world every day more than 40,000 children were suffering from lack of clean water and infectious diseases and even death.Although the Earth's surface 2 / 3 of the places covered by water.But bitter and salty sea water accounted for 96.5%.The remaining 3.5% of fresh water.Nearly 70% of solid ice has not been used.The present availability of freshwater resources.Main river,lake water and shallow groundwater,the total water volume of only 0.3% of the Earth.Fresh water resources around the world can use only 900 billion cubic meters annually.About 180 cubic meters per capita.China's per capita fresh water resources is less than the world average of 1,4.Estimated 8,000 million people suffer by water shortage.

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