overgrown in algae and other aquatic plants. The plants die and decompose. In decomposing the plants rob the water of oxygen and the lake, river or stream becomes lifeless. Nitrate fertilizers which drain from the fields, nutrients from animal wastes and human sewage are the primary causes of eutrophication. They have high biological oxygen demand (BOD) (EMWIS 2010
http://www.semide.net/portal_thesaurus/search_html)
Food security
When all people at all times have access to sufficient, safe, nu- tritious food to maintain a healthy and active life (WHO 2010
http://www.who.int/trade/glossary/story028/en/)
Green city Today, many city mayors are working to get their cities focused on the environmental movement. For many of those mayors, their goal is to convert their city into a green city. By thriving to achieve green city status, leaders are acting to improve the quality of the air, lower the use of non-renewable resources, encourage the building of green homes, offices, and other structures, reserve more green space, support environmentally-friendly methods of transportation, and offer recycling programmes (
Wisegeek.com undated
http://www.wisegeek.com/what-is-a-green-city.htm)
Green technology
A continuously evolving group of methods and materials, from techniques for generating energy to non-toxic cleaning products. The goals that inform developments in this rapidly growing field include sustainability, “cradle-to-cradle” design, source reduction, innovation, viability, energy, green building, environmentally preferred purchasing, green chemistry, and green nanotechnology (Green Technology 2006 http://www.
green-technology.org/what.htm)
Groundwater Freshwater beneath the earth’s surface (usually in aquifers)
supplying wells and springs. Because groundwater is a major source of drinking water, there is a growing concern over leach- ing of agricultural and industrial pollutants or substances from underground storage tanks (United Nations Statistics Division 2006
http://unstats.un.org/unsd/environmentgl/gesform. asp?getitem=586)
Irrigation
Artificial application of water to land to assist in the grow- ing of crops and pastures. It is carried out by spraying water under pressure (spray irrigation) or by pumping water onto the land (flood irrigation) (United Nations Statistics Division 2006
http://unstats.un.org/unsd/environmentgl/gesform. asp?getitem=685)
Marine pollution
Direct or indirect introduction by humans of substances or energy into the marine environment (including estuaries), re- sulting in harm to living resources, hazards to human health, hindrances to marine activities including fishing, impairment of the quality of sea water and reduction of amenities (United Nations Statistics Division 2006
http://unstats.un.org/unsd/ environmentgl/
gesform.asp?getitem=738)
Market and non-market values Most environmental goods and services, such as clean air and water, and healthy fish and wildlife populations, are not traded in markets. Their economic value -how much people would be willing to pay for them- is not revealed in market prices. The only option for assigning monetary values to them is to rely on non-market valuation methods. Without these value estimates, these resources may be implicitly underval- ued and decisions regarding their use and stewardship may not accurately reflect their true value to society (GreenFacts 2009
http://www.greenfacts.org/glossary/mno/non-market- value.htm)
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