How human activity can make water stress worse- pollution, over extraction and salt water incursion

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  • How human activity can make water stress worse- pollution, over extraction and salt water incursion
    • Sewage disposal in developing countries is expected to cause 135 million deaths by 2020.
      • In the UK we add 1,400 million liters of sewage to our rivers daily although most of it has been treated.
    • Chemical fertilisers contaminate groundwater as well as river and water supplies.
      • These add nutrients to the water leading to an increase in the growth of algae downstream
    • Industrial waste- every year the world generate 400 billion tonnes of industrial waste which is pumped untreated into rivers, seas ect
    • Dams- trap sediment in reservoirs which reduces floodplain fertility and the flow of nutrient for rivers into sea.
    • Abstraction- removing water from rivers and groundwater sources can cause issues that in some arid areas rainfall can never recharge
      • these underground stores and the removal of freshwater from the aquifers in coastal locations can lead to salt water incursion

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