The Great Lakes, including Lake Superior, Lake Michigan, Lake Huron, Lake Erie and Lake Ontario, are the largest freshwater lakes in the world, accounts for about 18% of the world 's fresh water resources. They are rich in water and other resources and the area of the Great Lakes extend more than 1200 km. The storage capacity of Great Lakes is about 23000 km3 and the surface area is around 244000 km2. Nowadays 1/10 of the Americans and a quarter of Canadians live in the lakes. Some of the world 's largest industrial center is built on here. Almost 25% of total agricultural production in Canada and 7% in the United States will yield in this area. Although the area of the lake is large, it could be affected by a wide range of pollutions vulnerably. Lakes pollution sources include soil runoff, agricultural chemicals, municipal waste, industrial emissions and waste disposal exudate. It is vulnerable to be affected by the pollutants company with rain, snow and dust in the atmosphere because of the broad surfaces of the lakes. The outflows from the Great Lakes are less than the total storage capacity so that the pollutants directly discharged into the lake from the coast or tributaries of the lake would be retained in the lake in the system. Consequently, the concentration of pollutants will be increasingly higher as time goes on. Furthermore they will stay in the system and continue to cycle through the food chain in the ecosystem because of the re-suspended sediments. Other than that non-point source pollution in the Great Lakes would result in habitat change and loss of biodiversity affecting human health. So as one of the main pollutants, non-point source pollution in the Great Lakes will be discussed in this paper.
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...ere getting into trouble. The flat fibrous alga which is in nutrient-rich conditions grows rapidly becoming the main plant near coast. The beach was around by green, slimy rot blob and the increasingly cloudy water made the lake green brown and black. The deterioration of ecological environment in the Lake Erie made the government respond to the issues. Canada and the United States signed the Great Lakes Water Quality Agreement in 1972. The two countries began to work together to clean the Great Lakes. They developed new pollution control measures to deal with water quality issues focusing on reducing phosphorus into the lake.
• Toxic pollutants
Since the 1940s, due to the development of industry, large-scale use of synthetic organic chemicals and substances containing heavy metals produces toxic pollutants to the environment and the potential harm to human health.
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