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Renewable surface water produced internally Renewable surface water produced internally
It is difficult to determine the amount of renewable water produced internally from the total renewable water resources (external and internal). However the FAO gives a rather precise definition of this indicator. Internal Renewable Water Resources (IRWR) includes: - Average precipitation: long-term double average over space and time of the precipitation falling on the country in a year. - Surface water produced internally: long-term average an...
26 Jan 2009 - by GRID-Arendal
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Impact of sea level rise in Bangladesh Impact of sea level rise in Bangladesh
Impact of sea level rise in Bangladesh. three maps in a time relapse resulting in 18 million people affected, 22,000 km2 of land submerged by flooding.
26 Jan 2009 - by Phillipe Rekacewicz, February 2008
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Trends in global water use by sector Trends in global water use by sector
The greyband represents in the difference between the amount of water extracted and that actually consumed. Water may be extracted, used, recycled (or returned to rivers or aquifers) and reused several times over. Consumption is final use of water, after which it can no longer be reused. That extractions have increase at a much faster rate is an indication of how much more intensively we can now exploit water. Only a fraction of water extracted i...
26 Jan 2009 - by GRID-Arendal
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Main world’s river basins Main world’s river basins
Reservoirs are artificial lakes, produced by constructing physical barriers across flowing rivers, which allow the water to pool and be used for various purposes. The volume of water stored in reservoirs worldwide is estimated to be 4,286 km3 (Groombridge and Jenkins, 1998). Wetlands include swamps, bogs, marshes, mires, lagoons and floodplains. The 10 largest wetlands in the world by area are: West Siberian Lowlands (780,000-1,000,000 km2), Ama...
26 Jan 2009 - by Phillipe Rekacewicz, February 2008
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Excessive withdrawal of renewable water resources Excessive withdrawal of renewable water resources
The countries known to be experiencing stress or scarcity of water per capita are roughly those which are excessively using their renewable water resources (North Africa, Middle-East and central Asia including Afghanistan and Pakistan). Excessive use is also of concern in some of the northern European countries such as Germany, Denmark or Poland. More so, as a consequence of damming, the Tigris and Euphrates in the eastern mountains of Turkey are...
26 Jan 2009 - by Philippe Rekacewicz (Le Monde diplomatique), February 2006
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Freshwater resources: volume by continent Freshwater resources: volume by continent
Glaciers and ice caps cover about 10% of the world’s landmass. These are concentrated in Greenland and Antarctica and contain 70% of the world’s freshwater. Unfortunately, most of these resources are located far from human habitation and are not readily accessible for human use. According to the United States Geological Survey (USGS), 96% of the world’s frozen freshwater is at the South and North Poles, with the remaining 4% spread over 550,000 k...
01 Oct 2009 - by Philippe Rekacewicz (Le Monde diplomatique)
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When the city harms its own water resources 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 semi-arid regions. Despite their widespread presence, groundwater aquifers in arid areas receive only limited or seasonal recharge, making such aquifers susceptible to rapid depletion. The Northern Sahara Basin Aquifer, for example,...
01 Oct 2009 - by Philippe Rekacewicz
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The WWF living planet index for freshwater 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 response to declining natural fisheries, often exacerbating the degradation of inland and coastal ecosystems through habitat alteration, pollution and the introduction of alien species' (Revenga et al., 1998). The Freshwater Specie...
26 Jan 2009 - by GRID-Arendal
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Damming the world 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 about 45 m in the 1990s, due largely to construction trends in Asia. The average area and volume of freshwater reservoirs have also steadily increased, rising to about 50 km2 between 1945 and1970, declining through the 1980s to 1...
26 Jan 2009 - by Phillippe Rekacewicz, February 2006
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Estimated Residence time of water resources Estimated Residence time of water resources
Estimated Residence time of water resources
26 Jan 2009 - by Phillipe Rekacewicz, February 2008
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Who will not reach the water and sanitation millennium development goal? Who will not reach the water and sanitation millennium development goal?
Graphic captioning the time at which Waste water will become suitable levels of consumption.
26 Jan 2009 - by Phillippe Rekacewicz, February 2006
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Transboundary water governance - averting conflict Transboundary water governance - averting conflict
Most governments recognize that violence over water is seldom strategically workable or economically viable and the most hostile enemies have a capacity for cooperation where water is concerned. The institutions that they create to avert conflict have shown extraordinary resilience. The considerable time taken to negotiate the establishment of these institutions - 40 years for the Jordan agreement for example - bears testimony to the sensitivity ...
26 Jan 2009 - by GRID-Arendal
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Industrial areas and seasonal zones of oxygen depleted waters Industrial areas and seasonal zones of oxygen depleted waters
This graphic illustrates the strong link between areas with high densities of industrial activity and zones of seasonally oxygen-depleted waters. There is a strong link between areas with high densities of industrial activity and zones of seasonal oxygen-depleted waters. In recent years there has been an increasing focus on treating and reducing municipal and industrial waste, and on reducing nitrogen levels in agricultural runoff. However, less...
26 Jan 2009 - by Phillipe Rekacewicz, (Le Monde diplomatique) February 2008
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Total population: access to an improved water source Total population: access to an improved water source
The 2004 global image sadly shows that the lack of access to clean water remains a burden for the poorest countries, preventing them accelerating their development. Essentially handicapping most sub-Saharan African countries, the map shows some curious trends, such as Romania, which remains far behind all other European countries.
26 Jan 2009 - by Phillippe Rekacewicz, February 2006
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Marine species diversity Marine species diversity
Limited information is available on species diversity and the condition of coastal and marine ecosystems (Burke et al., 2001). There is growing evidence that many marine species are less widely distributed, and therefore more vulnerable to extinction, than previously thought (GESAMP, 2001a). The protection and sustainable use of marine resources and biodiversity are governed by several international conventions, including the Convention on Biolog...
26 Jan 2009 - by World Resource Institute (WRI), Washington Dc, 1998, based on data from UNEP-WCMC.
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Impact of sea level rise on the Nile delta Impact of sea level rise on the Nile delta
Impact of sea level rise on the Nile delta. Sea level elevation model used to produce impact of nile delta sea level rise.
26 Jan 2009 - by Phillipe Rekacewicz, Otto Simonett - February 2008
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Lake Chad: almost gone 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 dramatic decrease in the size of the lake over the past 30 years. Since 1963, the lake has shrunk to nearly a twentieth of its original size, due both to climatic changes and to high demands for agricultural water. Since 1963, the surfac...
06 Nov 2009 - by Philippe Rekacewicz (Le Monde diplomatique), February 2006
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Global waterstress and scarcity Global waterstress and scarcity
Water scarcity occurs when the amount of water withdrawn from lakes, rivers or groundwater is so great that water supplies are no longer adequate to satisfy all human or ecosystem requirements, resulting in increased competition between water users and other demands.
26 Jan 2009 - by Philippe Rekacewicz (Le Monde diplomatique), February 2006
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Runoff-Typewriter Runoff-Typewriter
Graphics captions water run off annually water per continent. Run off is scaled km cubed per year.
26 Jan 2009 - by Phillipe Rekacewicz, February 2008
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Production mondiale annuelle de biocarburants Production mondiale annuelle de biocarburants
La production de biodiesel et d’éthanol a augmenté sensiblement au cours des dernières années
08 Jun 2009 - by Hugo Ahlenius, UNEP/GRID-Arendal
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