The idea of holding it was first voiced at the United Nations Conference on Environment and Development (UNCED), which was held in 1992 in Rio de Janeiro.
Water is the "cornerstone" of life. Water is necessary for mankind. A drop of water has the power, a drop of water is necessary for everyone. Although 70% of the earth's surface is covered with water, 97.5% is salt water. Out of the remaining 2.5% of fresh water, almost 68.7% is the frozen water of ice caps and glaciers. Only one percent of the total water resources of the planet are available for human use. To date, more than 663 million people have no sources of drinking water near their homes.
In the 20th century, the use of water increased 6-fold and more than 2-fold higher than the rate of population growth. In developed countries up to 30% of fresh water reserves are lost due to leaks, and in some large cities, losses can reach 70%.