Although 70 8% of the earth is covered by oceans, the global water storage is about 1 37 billion cubic kilometers, but only 2 53% of fresh water is available  Of all this fresh water, 68 7% are stored in Antarctic and Arctic glaciers and permanent snow caps, and it will take time for humans to use these freshwater resources
Due to the excessive blind exploitation of water resources, wanton waste and pollution, there are fewer and fewer freshwater resources that human beings can use
As freshwater resources have not been fully exploited, there is great potential for human beings to make use of freshwater resources