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Alkalinity is commonly used to indicate a water body’s capacity to buffer against acidity; that is, the ability to resist, or dampen, changes in pH. Thus, alkaline compounds in water, such as bicarbonates, carbonates, and hydroxides, lower the acidity of the water and increase the pH. Alkalinity (as CaCO3) was analysed for all sampling stations available at the continental level. Concentrations remained reasonably steady between the two decades for Africa, Asia, South America and Australasia, but significant increases were noted for European and North American rivers, which may indicate a shift towards reduced acidic impacts at the continental scale. Overall, during the last 30 years , alkalinity has decreased in North America and Europe, but has significantly increased in Asia. Examination of the outflow stations in 82 monitored river basins indicate a decrease in bicarbonate concentrations between the two decades , in the northern latitudes, including North America, Europe and Asia. For the period 1976-1990, European rivers displayed the highest concentrations of calcium at a continental level, with concentrations varying between 2 mg and 50 mg per litre for major rivers. Comparing the two decades, observations of surface water showed an increase in calcium concentrations in the Laurentian shield region of North America, and in the rivers of the north central European region.
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This photo has been graciously provided to be used in the GRID-Arendal resources library by: Philippe Rekacewicz, February 2006
Environment
The 8th Edition of Environment builds on the previous comprehensive, systems-based environmental science issue with more in-depth information on systems approach, which emphasizes the interconnected nature of environmental science throughout the text. The book is even more...
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 species. Many are yet to be discovered, but the number of freshwater species worldwide is estimated at between 9,000 and 25,000 (Cosgrove and Rijsberman, 2000). However, this number is rapidly decreasing due to human interference. Physical alteration, habitat degradation, excessive water withdrawal and pollution have contributed directly or indirectly to the decline in freshwater species. Other factors that reduce freshwater biodiversity include the incursion of non-native species and the mismanagement of inland fisheries. Today, an estimated 20% of the world’s freshwater fish is vulnerable, endangered or extinct (Revenga et al., 1998).
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This photo has been graciously provided to be used in the GRID-Arendal resources library by: Philippe Rekacewicz, February 2006
autor : Wilson Andrés Arenales Cáceres
Les dejo mis redes sociales a esas personas que siempre me apoyan en flickr, no quiero perder el contacto con la gente, mi facebook seria este www.facebook.com/wilsoncaceresart y para diseñadores y artistas que ya tengan behance, el mio seria www.behance.net/wilsoncaceres .
Espero que sigamos en contacto no se pierdan :D gracias por haberme apoyado durante tanto tiempo
Aftonbladet is a Swedish tabloid founded by Lars Johan Hierta in 1830 during the modernization of Sweden. It is one of the larger daily newspapers in the Nordic countries. Aftonbladet is owned by the Swedish Trade Union Confederation (LO) and Norwegian media group Schibsted, and its editorial page describes it as an "independent social-democratic newspaper". In 2006 the paper had 1,425,000 daily readers, circa 15% of the Swedish population. (Source: Wikipedia).
The Ministry of the Environment (Swedish: Miljödepartementet) is a government ministry in Sweden responsible for environmental issues and construction. The ministry also has the overall responsibility for coordinating the government's work on sustainable development. The ministry offices are located at this building at the Tegelbacken 2 in central Stockholm. (Source: Google).
Public Clock Photography by Arjan Richter
Four LNG terminals are approved for construction in the Great Barrier Reef World Heritage Area, leading to direct criticism from the World Heritage Committee monitoring mission that “the decisions that were taken to proceed with approvals based on offsetting therefore appear to not correspond to an agreed approach within the World Heritage Convention.
Turkey vultures fly above the Norris Farm Landfill in Dundalk, Md., during the National Audubon Society's 117th annual Christmas Bird Count in Baltimore County, Md., on Dec. 31, 2016. (Photo by Will Parson/Chesapeake Bay Program)
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Increasing floods in between dry periods represent ideal conditions for spreading diseases such as cholera. In Nouakchott, the capital of Mauritania located in the desert, precipitations - when they occur - are always accompanied by a cholera epidemic, especially in poor areas where waste matter is not managed. Cholera had almost disappeared globally by the mid 1950s, but it reappeared and spread throughout the world during the last few decades. The World Health Organization (WHO) fears that a rapidly changing climate, combined with declining socio-economic conditions in the poorest part of the population, will contribute to an increasing spread of the disease.
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This photo has been graciously provided to be used in the GRID-Arendal resources library by: Philippe Rekacewicz, February 2006
Quick-Look Hill-shaded Colour Relief Image of 2014 2m LIDAR Composite Digital Surface Model (DSM).
Data supplied by Environment Agency under the Open Government License agreement. For details please go to: www.nationalarchives.gov.uk/doc/open-government-licence/v...
For full raster dataset go to: environment.data.gov.uk/ds/survey
Quick-Look Hill-shaded Colour Relief Image of 2014 1m LIDAR Composite Digital Terrain Model (DTM).
Data supplied by Environment Agency under the Open Government License agreement. For details please go to: www.nationalarchives.gov.uk/doc/open-government-licence/v...
For full raster dataset go to: environment.data.gov.uk/ds/survey
Comparative vulnerability of national economies to climate impacts on fisheries. Vulnerability of national economies of potential climate change impacts on fisheries (which integrates exposure, sensitivity and adaptive capacity) under IPCC scenario B2 (local development, lower emissions).
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This photo has been graciously provided to be used in the GRID-Arendal resources library by: Giulio Frigieri
IAEA Radiometrics Laboratory Head Hartmut Nies observes as TEPCO subcontractors collect sea water samples near the damaged Fukushima Daiichi Nuclear Power Station. 7 November 2013. IAEA marine monitoring experts were sent to Japan to observe sea water sampling and data analysis.
IAEA/David Osborn
Quick-Look Hill-shaded Colour Relief Image of 2014 2m LIDAR Composite Digital Terrain Model (DTM).
Data supplied by Environment Agency under the Open Government License agreement. For details please go to: www.nationalarchives.gov.uk/doc/open-government-licence/v...
For full raster dataset go to: environment.data.gov.uk/ds/survey
"We do not inherit the earth from our ancestors, we borrow it from our children." - Native American Proverb
May 24, 2017- Altmar, NY - Governor Andrew M. Cuomo today announced the state has acquired more than 6,000 acres of protected lands in Oswego County, the largest additions to state lands in Central New York in 45 years. These areas include approximately 2,825 acres of lands along the Salmon River, an internationally acclaimed fishing destination, and 3,236 acres of working forestland in the nearby towns of Redfield and Orwell. This forestland acquisition will help to secure the working landscape of the Tug Hill region that provides vital economic support to local communities. (Philip Kamrass/ Office of Governor Andrew M. Cuomo)