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Concentration Extent Concentration Extent
Reduced sea ice amplifies warming.
27 Oct 2009 - by Laura Margueritte
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Surface Temperature Surface Temperature
At the regional, ocean basin scale, the area between the insulating sea-ice cover and the open ocean (known as the ice margin) is characterized by particularly strong temperature gradients during winter, favoring the development of low pressure systems along the edge of the ice, as well as smaller, intense features known as polar lows that present hazards to shipping.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Regional Distribution of Sea-level Trends 1950-2003 Regional Distribution of Sea-level Trends 1950-2003
Satellite altimetry data has revealed that sea level is not rising uniformly.
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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Wastewater, a global problem with differing regional issues Wastewater, a global problem with differing regional issues
The significance of wastewater and contents of wastewater vary greatly between and even within regions. In Africa for example, it is the impact on people’s health that is the major factor, in Europe, the input of nutrients into the coastal waters reducing productivity and creating anoxic dead zones.
01 Mar 2010 - by UNEP/GRID-Arendal
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Wastewater - Contaminants and their effects Wastewater - Contaminants and their effects
The contaminants in waste- water come from many different sources and can have cumulative and synergistic effects requiring a multi-pronged response.
01 Mar 2010 - by UNEP/GRID-Arendal
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Water withdrawal and use Water withdrawal and use
Regional variation in water withdrawal per capita and its use by sector.
01 Mar 2010 - by UNEP/GRID-Arendal
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Water desalination Water desalination
Desalination is an increasingly important practice to secure clean water in a number of countries. Monitoring is key to minimize negative impacts on the ecosystem.
01 Mar 2010 - by UNEP/GRID-Arendal
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A look inside - Concentrations of micro-organisms excreted in one litre of wastewater A look inside - Concentrations of micro-organisms excreted in one litre of wastewater
What one litre of wastewater might contain in terms of pathogens.
01 Mar 2010 - by UNEP/GRID-Arendal
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World population living in river basins with severe water stress World population living in river basins with severe water stress
Increasing water scarcity with population increase.
01 Mar 2010 - by Giulio Frigieri
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Population living in river basins where freshwater withdrawal exceeds 40 per cent of renewable resources 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
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Wastewater in urban agriculture - Resource or threat? Wastewater in urban agriculture - Resource or threat?
Is reuse of wastewater a benefit or a threat for agri- culture?
01 Mar 2010 - by UNEP/GRID-Arendal
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Sanitation sewage and treatment in big cities - Two study cases Sanitation sewage and treatment in big cities - Two study cases
Case study to compare two urban centres.
01 Mar 2010 - by UNEP/GRID-Arendal
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Access to sanitation facilities Access to sanitation facilities
Access to improved sanitation remains a pressing issue in many regions.
01 Mar 2010 - by UNEP/GRID-Arendal
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Freshwater and wastewater cycle - Water withdrawal and pollutant discharge Freshwater and wastewater cycle - Water withdrawal and pollutant discharge
As water is extracted and used along the supply chain, both the quality and quantity of water is reduced.
01 Mar 2010 - by UNEP/GRID-Arendal
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Distribution of causes of death among children under five years and within neonatal period Distribution of causes of death among children under five years and within neonatal period
Distribution of causes of death among children un- der five years and within the neonatal period, 2004 (Figure from WHO, 2008).
01 Mar 2010 - by UNEP/GRID-Arendal
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Centralized or decentralized? - Uganda. A study case Centralized or decentralized? - Uganda. A study case
Looking at the costs and benefits, centralized systems may not be the answer in terms of best result for the investment. The chart on the left shows that the financial NPV does not change with increasing population size for centralized sewage and wastewater connection, however the economic NPV (which includes benefits to health and the environment) shows a positive trend with increas- ing populations. Centralized systems therefore generate a grea...
01 Mar 2010 - by UNEP/GRID-Arendal
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World fresh water supply 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
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Water for food Water for food
The volume of water required to produce different food products varies enourmously, as do the waste products.
01 Mar 2010 - by UNEP/GRID-Arendal
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Population increase and water resources Population increase and water resources
The world’s water resources will not change, but the human population and its demands on supply are growing rap- idly. Meeting these demands will require wise investment in how we use and reuse our water (UN Water Statistics).
01 Mar 2010 - by UNEP/GRID-Arendal
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Wastewater, Health and Human well being - Investing in water supply and sanitation Wastewater, Health and Human well being - Investing in water supply and sanitation
Investment to improve basic access to a safe water source and sanitation (WHO scenario A) can have a significant return with the largest impact on health in particular averting diarrhoea cases and time saved (increasing productivity). Urbanized areas provide a large proportion of GDP, therefore the future development of developing countries is dependent on the productivity of growing urban areas.
01 Mar 2010 - by UNEP/GRID-Arendal
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