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Hydropower potential (theoretical possitibility for electricity generation) Hydropower potential (theoretical possitibility for electricity generation)
xHydropower, generating electricity through turbines, represents a clean and renewable energy source, but not without problems. Dams and reservoirs disrupt the natural flow, and may increase siltation and evaporation, in addition to severe impacts for wildlife, for instance migrating fish. The gross theoretical capability, presented in this map, represents a calculation based on the topography and precipitation in the countries, and is the amount...
20 Jul 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
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Major River Systems in the Arctic Major River Systems in the Arctic
The Arctic has several of the world’s largest rivers.This graphic shows the major river systems of the Arctic and their annual discharges in cubic kilometres, and the catchment area of the Arctic Ocean. The major river systems shown are the Mackenzie, Yukon, Nelson, Kolyma, Indigirka, Lena, Kotya, Yenisey, Ob, Pechora, Severnyy and Dvina.
28 Sep 2005 - by CAFF (Conservation of Arctic Flora and Fauna); see source field
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Trends in continental river discharge Trends in continental river discharge
River flow is cyclical in nature, with alternating cycles of wet and dry years. This graphic uses bar graphs to show the average annual volumes of river runoff in cubic kilometres for each continent from 1921 to 1985. Over the time period the discharge there has been no obvious trends, but a certain degree of fluctation, the level dependent on the area of the basins and the precipitation over the area. The sizes of the bars in this graph reflect ...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
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Kara-Bogaz-Gol - restoration of previous water levels after 1992 (Turkmenistan, Caspian Sea) Kara-Bogaz-Gol - restoration of previous water levels after 1992 (Turkmenistan, Caspian Sea)
Kara-Bogaz-Gol is a lowland area that forms a highly saline bay on the east side of the Caspian Sea, in Turkmenistan. In Soviet times it was decided to set up a dam to block the flow of saline water from the bay to the Caspian Sea, and this was completed in 1980. The ensuing increase in the salt content of the southern part of the Caspian Sea, to levels exceeding 15 grams per litre, had disastrous consequences for the sturgeon population. In the ...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
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Hydropower potential (theoretical possitibility for electricity generation) Hydropower potential (theoretical possitibility for electricity generation)
Hydropower, generating electricity through turbines, represents a clean and renewable energy source, but not without problems. Dams and reservoirs disrupt the natural flow, and may increase siltation and evaporation, in addition to severe impacts for wildlife, for instance migrating fish. The gross theoretical capability, presented in this map, represents a calculation based on the topography and precipitation in the countries, and is the amount ...
20 Jul 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
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Natural resource - water (freshwater run-off) Natural resource - water (freshwater run-off)
Freshwater – a natural resource which has been adopted as a human right by the UN in 2002: 'the human right to water entitles everyone to sufficient; affordable; physically accessible; safe and acceptable water for personal and domestic uses'. People depend on this resource for drinking and cooking, for irrigation of farms, for hygiene and sanitation and for power generation. The map presenting this resource only focuses on one part of the geogra...
12 May 2008 - by Hugo Ahlenius, UNEP/GRID-Arendal
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Global Carbon Storage in Soils Global Carbon Storage in Soils
Arctic terrestrial ecosystems will continue to take up carbon, but warming and changes in surface hydrology will cause a far greater release of carbon.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Tigris and Euphrates rivers fragmentation Tigris and Euphrates rivers fragmentation
It has been predicted that access to water will create conflict between countries. In Africa, central Asia, west Asia and the Americas, some countries are already arguing fiercely over access to rivers and inland seas, and confrontations could arise as water shortages grow (Gleick, 2000). Countries currently or potentially involved in international disputes over access to river water and aquifers include: - Turkey, Syria and Iraq (the Tigris and...
26 Jan 2009 - by Philippe Rekacewicz
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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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