Along with the development of society, more and more phenomenon are brought into our attention, one of which is water shortage. Many people think that water will be plentiful. This might be because 70% of our planet is covered by water. However, freshwater which is the stuff we drink, bathe in, irrigate our fields is extremely scarce. In fact, more than 97% of the planet’s water is in the ocean, and only 3% of water in the world is fresh water. Approximately two-thirds of fresh water is tucked away in the polar icecaps. As the result, there are a lot of regions facing with severe water shortages which are Africa, northern China, pockets of India, Mexico, the Middle East and even parts of western North America.