Lesson 3 (environmental problems in asia)
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Lesson 3 (environmental problems in asia)

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Lesson 3 (environmental problems in asia) Lesson 3 (environmental problems in asia) Presentation Transcript

  • ENVIRONMENTAL PROBLEMS IN ASIA
  • Environmental Problems in Asia
    Two major factors:
    Unparalleled economic development of the different countries in Asia
    Incessant increase of human population
  • Desertification
    Salinization
    Alkalization
    Intensified use to meet food supply needed
  • Contamination
    Problems in waste disposal
    Rapid population growth
  • Land degradation
    AAZLINNOTISI
    SALINIZATION
    ZLAAKATNILOI
    ALKALIZATION
    NRDSCEIEIFIATTO
    DESERTIFICATION
    Remember SAD
  • Salinization and Alkalization
    When salts come to the surface of the land or are carried in by water
    When water well are overused, the water table lowers and saltwater or brackish water start to permeate
    Bangladesh
  • Desertification
    Transformation of fertile land into a desert through soil erosion or overcultivation
    If it persists  will bring about serious health hazards; food scarcity, dust storms
    China
  • Overgrazing
  • As the size of animal herds increases, more pressure is wielded on the grazing lands
    Iraq: sustains 11 million sheep which exceeds the lands’ grazing capacity
  • ZIIBRANNAUTO
    URBANIZATION
  • Urbanization in Asia
    Led to the proliferation of depressed or slum areas
  • SWEAT AISSODLP
    WASTE DISPOSAL
  • Problem on Solid waste disposal
    Two types of wastes:
    Domestic
    Industrial
    Health risks, degradation of the environment
  • Loss of Biodiversity
    Introduction of non-indigenous species of flora and fauna in a particular region
    Pollution of soil, water and air
    Rapid growth of the population
    Intensification of the use of land
    Deforestation
    Exploitation of natural resources
    ?
  • POLLUTION
    LOLOUNPTI
  • Pollution
    Air - sulfur & coal
    - Traffic in major cities (Beijing, Korea, etc.)
    - gas pollutants affect the quality of air
    - lead to respiratory diseases
  • Water Pollution
    Two most common water pollutants:
    Solid waste
    Untreated wastewater from industries and factories
    Marine Water:
    Oil spills
    Residues of pesticides
    Red tide
     dinoflagellates
     may lead to poisoning of people
  • Water Pollution
    Freshwater
    Pollution caused by rapid urbanization and industrialization
    Industrial effluents, heavy chemicals and solid wastes  directly released to inland bodies of water
    Mine tailings (rejected materials from mining processes)
    Siltation
  • Water Pollution
    Freshwater
    Siltation
    Accumulation of fine-grained sandy sediment carried by water
     two main causes:
    1. Deforestation
    2. Soil erosion
    Tonle Sap
  • Clearing of forest trees
    Loss of natural habitat
     flora and fauna endangered
    Causes of deforestation:
    Commercial logging
    Slash and burn agriculture
    Cutting down of trees for fuel wood and forest fires
    NEODFTESAROTI
    DEFORESTATION
  • North Asia: environmental problems
    Pollution: due to waste
    - radioactive uranium plants in Kazakhstan
    - waste dumped in rivers: threaten water source
    - extensive soil erosion
    Uranium radioactivity causes mutations and growth of cancer cells
    Uzbekistan’s water is under radioactive threat
  • The importance of ecological balance in asia