The total volume of water on earth: 104 crore km3. The volume of accessible freshwater: 90 lakh km3. In a few decades, that might not be enough to sustain the entire humanity, warn UN agencies.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/water-worries-compound
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/week-kochi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-demand
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water-scarcity
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/un
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global