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Global Environment Monitoring Systems (GEMS), Freshwater Quality Programme, United Nations Environment Programme (UNEP), 2001
Uploaded on Saturday 25 Feb 2012
Regional alkalinity trends
Philippe Rekacewicz, UNEP/GRID-Arendal
Measuring alkalinity determins a stream's ability to neutralize acidic pollution from rainfall or wastewater. Alkalinity refers to the ability of water to resist change in pH. The graphic shows global comparison of alkalinity measured in milligrams per litre, for the years 1976 and 2000.