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The volume of freshwater resources on Earth is around 35 million km3

The total volume of water on Earth is about 1.4 billion km3. The volume of freshwater resources is around 35 million km3, or about 2.5 percent of the total volume. Of these freshwater resources, about 24 million km3 or 70 percent is in the form of ice and permanent snow cover in mountainous regions, the Antarctic and Arctic regions.

United Nations Environment Programme (UNEP)
  

The food sector is responsible for about half of the production of organic water pollutants

The food sector contributes respectively 40 and 54 percent to the production of organic water pollutants in high-income and low-income countries.

Global Environment Outlook 4
  

Increases in fertilizer use for food production suggest a 10-20% global increase in river nitrogen pollution

Projected increases in fertilizer use for food production and in wastewater effluents over the next three decades suggest there will be a 10-20 percent global increase in river nitrogen flows to coastal ecosystems.

Global Environment Outlook 4
  

Half of the world's wetlands have been lost since 1900.

World Water Assessment Programme
  

Many polluting industries are moving to emerging market economies

Many industries – some of them known to be heavily polluting (such as leather and chemicals) – are moving from high-income countries to emerging market economies. Despite improvements in some regions, water pollution is on the rise globally.

World Water Assessment Programme
  

Up to 90 % of wastewater in developing countries flows untreated into water bodies

Up to 90 % of wastewater in developing countries flows untreated into rivers, lakes and highly productive coastal zones, threatening health, food security and access to safe drinking and bathing water.

World Water Development Report 2012
  

Over 80% of wastewater is not collected or treated worldwide

Over 80 per cent of wastewater worldwide is not collected or treated, and urban settlements are the main source of pollution.

World Water Development Report 2012
  
Last update:18 Sep 2014