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Tag: Freshwater

Extent of cultivated systems, 2000
More land was converted to cropland in the 30 years after 1950 than in the 150 years between 1700 and 1850. Cultivated systems (areas where at least 30% of the landscape is in croplands,shifting cultivation, confined liv...
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Water withdrawals in 2050
Current patterns of human use of water are unsustainable. From 5% to possibly 25% of global freshwater use exceeds longterm accessible supplies and is met through engineered water transfers or the overdraft of groundwate...
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Comparison of global river nitrogen export from natural ecosystems, agricultural systems, and sewage effluents, 1975 and 1990
Nutrient loading is projected to become an increasingly severe problem, particularly in developing countries. Nutrient loading already has major adverse effects on freshwater ecosystems and coastal regions in both indust...
30 Nov 2007 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Agricultural water withdrawals as proportion of total water withdrawals
Agriculture already consumes 70% of all global freshwater withdrawn worldwide and has depleted soil nutrients, resulting in N, P and K deficiencies covering 59%, 85%, and 90% of harvested area respectively in the year 20...
03 Jan 2008 - by IAASTD/Ketill Berger, UNEP/GRID-Arendal
Population living in river basins where freshwater withdrawal exceeds 40 per cent of renewable resources
Population by region was calculated averaging the results forecasted by the scenarios of the GEO-4 report using the WaterGAP modeling.
01 Mar 2010 - by Giulio Frigieri
World fresh water supply
Water is the life force of our planet, but only 1 per cent of all the freshwater on Earth is available for human use.
01 Mar 2010 - by UNEP/GRID-Arendal
Arctic char species complex, distribution map
The Arctic char species complex, sensu stricto, represent a key component of the marine and freshwater ecosystems of the north. Chars are stressed by factors such as fisheries, climate change and pollutants. We are possi...
17 Mar 2010 - by Hugo Ahlenius, GRID-Arendal & CAFF
Water supply and sanitation coverage in Africa
The water supply situation in Africa is already precarious, and climate change is expected to exacerbate the problem. This graphic shows the amount of water supply coverage at the national level for Africa, and the amoun...
17 May 2005 - by Delphine Digout, based on a sketch by Philippe Rekacewicz; UNEP/GRID-Arendal
Nile Delta: Potential Impact of Sea Level Rise
The potential impacts of sea level rise on the Nile Delta are expected to include a decline in water quality that would affect freshwater fish, the flooding of agricultural land and damage to infrastructure. This graphic...
17 May 2005 - by Otto Simonett, UNEP/GRID-Arendal
Lake Chad - decrease in area 1963, 1973, 1987, 1997 and 2001
Straddling the borders of Nigeria, Chad, Niger and Cameroon in West Africa, Lake Chad has been a source of freshwater for irrigation projects in all these countries. This graphic traces the shrinkage of Lake Chad and cha...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Scaling up of community based natural resource managements projects - freshwater in asia
Starting in Bangladesh with a few watersheds, going up to the world. Fisheries and freshwater management (wetlands).
11 Jul 2006 - by Hugo Ahlenius, UNEP/GRID-Arendal
Lake Chad - decrease in area 1963, 1973, 1987, 1997 and 2001
Straddling the borders of Nigeria, Chad, Niger and Cameroon in West Africa, Lake Chad has been a source of freshwater for irrigation projects in all these countries. This graphic traces the shrinkage of Lake Chad and cha...
11 Jul 2006 - by Philippe Rekacewicz and Hugo Ahlenius UNEP/GRID-Arendal
Water competition between cities and agriculture
It is estimated that water pollution denies close to 1.3 billion people (20% of the global population in 2000) access to clean water supplies. In 1986, WHO reported that there were 250 million new cases of waterborne dis...
26 Jan 2009 - by Philippe Rekacewicz
Increased global water stress
According to Population Action International, based upon the UN Medium Population Projections of 1998, more than 2.8 billion people in 48 countries will face water stress, or scarcity conditions by 2025. Of these countri...
26 Jan 2009 - by Philippe Rekacewicz (Le Monde diplomatique), February 2006
The water cycle
Environment water transport system. The water cycle consists of precipitation, vapour transport, evaporation, evapo-transpiration, infiltration, groundwater flow and runoff. Figure 1 explains the global water cycle, ill...
01 Feb 2008 - by Philippe Rekacewicz , UNEP/GRID-Arendal
Freshwater use by sector at the beginning of the 2000s
The agricultural sector is by far the biggest user of freshwater. Analysis indicates that: - In the United States, agriculture accounts for some 49% of total freshwater use, with 80% of this volume being used for irriga...
26 Jan 2009 - by Philippe Rekacewicz (Le Monde diplomatique)
Water supply per river basin in 1995 and 2025
Although the absolute quantities of freshwater on earth have always remained approximately the same, the uneven distribution of water and human settlement continues to create growing problems freshwater availability and ...
26 Jan 2009 - by Philippe Rekacewicz,February 2006
Fish diversity in freshwater systems
Although freshwater ecosystems such as rivers, lakes and wetlands occupy less than 2% of the earth’s total land surface, they provide a wide range of habitats for a significant proportion of the world’s plant and animal ...
26 Jan 2009 - by Philippe Rekacewicz
Water withdrawal and consumption: the big gap
Freshwater use by continents is partly based on several socio-economic development factors, including population, physiographic, and climatic characteristics. Analysis indicates that: - Annual global freshwater withdraw...
26 Jan 2009 - by Phillipe Rekacewicz, February 2008
Human actions leading to coastal degradation
Physical alteration and the destruction of habitats are now considered one of the most significant threats to coastal areas. Half of the world’s wetlands, and even more of its mangrove forests, have been lost over the pa...
26 Jan 2009 - by Philippe Rekacewicz (Le Monde diplomatique), February 2006
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