| Popis: |
The oceans are the Earth’s primary conventional storage body for water, including the Antarctic, Arctic and glaciers of high mountain peaks. The groundwater represents 29.9%, and only 0.26% of the total freshwater is stored in lakes, rivers and reservoirs while 0.94% is soil moisture. The water available for direct human use comprises 96.80% groundwater, 0.02% river water and 3.18% in lakes, while desalinated water and treated wastewater are the main nonconventional sources of water. The rapid increase in population between 1970 and 2014 lowered the per capita water share from 12,900 m3 in 1970 to 5926 m3 in 2014. The main global water challenges are the uneven distribution of water resources, water-quality problems, escalating demands and climate change. |
