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Tag: Freshwater

World's surface water: evaporation and runoff
Because much of the world’s surface water is far from concentrations of human settlements, not all of it is readily usable. Some facts concerning global freshwater concentrations: - It is estimated that the freshwater ...
26 Jan 2009 - by Phillippe Rekacewicz (Le Monde diplomatique), February 2006
The Mekong River - survival for millions
The Mekong River - survival for millions Following the course of the Mekong River helps to understand the human/river hydrological interdependence. From its source on the Tibetan Plateau it drops 5,000 metres and flows a...
26 Jan 2009 - by Philippe Rekacewicz
Biological oxygen demand - BOD: 1976-2008
The availability of oxygen is one of the most important indicators of the condition of a water body, because dissolved oxygen, or DO, (the amount of oxygen dissolved in water) is necessary for most aquatic organisms, inc...
26 Jan 2009 - by Phillippe Rekacewicz, February 2006
Trends in capture fisheries and aquaculture
The levelling off of the global fisheries catch reflects a growing decline in most major fishing areas. Today, these fishing areas are producing lower yields than in the past, and it is unlikely that substantial increase...
26 Jan 2009 - by Philippe Rekacewicz
When the city harms its own water resources
In areas where surface water is not readily available (located far from areas of need), groundwater is the primary water source. Groundwater aquifers supply an estimated 20% of the global population living in arid and se...
01 Oct 2009 - by Philippe Rekacewicz
The WWF living planet index for freshwater
'The over-exploitation and mismanagement of fisheries, particularly when combined with other man-made stresses, can lead to the collapse of regional fish faunas. In many countries, aquaculture is rapidly increasing in re...
26 Jan 2009 - by GRID-Arendal
Damming the world
The construction of large dams - defined as those with walls at least 15 metres high - has increased significantly over the past 50 years. The average height of new dams, estimated at 30-34 m from 1940-1990, increased to...
26 Jan 2009 - by Phillippe Rekacewicz, February 2006
Lake Chad: almost gone
Straddling the borders of Chad, Niger and Cameroon in West Africa, Lake Chad has been a source of freshwater for irrigation projects in each of these countries. Maps drawn from a series of satellite images show a dramati...
06 Nov 2009 - by Philippe Rekacewicz (Le Monde diplomatique), February 2006
Water scarcity in Africa
Wetlands are essential in providing and storing freshwater, but today more than half of South Africa’s wetlands have been destroyed or degraded and it is estimated that by 2025 South Africa will suffer from water scarcit...
21 Jun 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Pressures on the South African coast
Population growth puts pressure on coastal ecosystems. Increased population means growing demand for land for housing and infrastructure, increased use of living resources for food, and more use of available freshwater r...
21 Jun 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Hydrogeology
Most of the Sumatran orangutan's forests inland play a key role in ensuring downstream freshwater supplies, since the non-alluvial inland areas of the region tend to have very little or no underlying groundwater resourc...
13 Sep 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Global flyways of the six subspecies of Red Knot
The Red Knot is a migratory shorebird that travels up to 20,000 km twice a year from its breeding grounds on the high Arctic tundra to its southern non-breeding sites. Along with having one of the longest total migrati...
15 Nov 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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