Drinking water and health, please talk about how this article reflects the scientific attitude and spirit from any angle.

According to the statistics of the World Health Organization, 80% of the diseases in the world are related to drinking water pollution, and one third of the deaths are caused by unclean drinking water. In China, 90% of urban waters are polluted to varying degrees. At present, more than 300 million rural residents do not have safe drinking water, and about 25 billion cubic meters of water cannot be used every year because of pollution. Over-exploitation of water resources by human beings also makes people get less and less clean water. How to get cheap and clean water has become a great challenge for mankind in the 2 1 century.