Pollution

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					          Pollution

 Definition: any substance added
to the environment that produces
   a condition that is harmful to
             organisms
                  Garbage
• One example of pollution is a solid
  waste that cannot be recycled.
          » Most garbage goes to a landfill, where it is
            prevented from entering the environment
Air Pollution
     Sources of air pollution
• Automobiles, airplanes, power plants,
  and factories all emit carbon dioxide
• Increased levels of carbon dioxide have
  caused global temperatures to rise
• This in turn , increases global climate
  change
Water Pollution
  How pollution enters water:
• 1. Point source pollution - when
  pollution enters a body of water at a
  specific place from an identifiable
  source
  – Examples: oil spills from tankers,
    wastewater from pulp and paper mills
• 2. Non - point source pollution- when
  pollution enters bodies of water
  indirectly when rain or snow travels over
  land and picks up pollutants from many
  different sources before entering a
  stream or lake
  – Examples: fertilizer and pesticides run off
    from farms, salt run off from roads
Great Pacific Garbage patch
                GYRES
• There are great circular ocean currents
  called gyres that swirl floating debris to
  their centre and this is where the
  garbage stays

• The North Pacific Ocean has 2 large
  gyres
          Human Pollution
• The United Nations Environment
  Programme ( UNEP) estimates that
  plastic debris kills more than a million
  sea birds each year
• Sea birds, sea turtles, and other
  animals mistake plastic for food
• Plastic can last for over 50 years in the
  ocean
Acid Rain
• Emissions from a variety of human
  activity contain pollutants

• Can you think of any ways this
  happens??
• In Canada emissions come from:
  – 1. Mining
  – 2. Refining metals
  – 3. Electric power generation
  – 4. Oils and gas operations
  – 5. automobiles
• Once these substances are released
  into the air, they combine with water
  vapour in the air and acid forms
• These acids fall as acid rain
• It affects soils, vegetation, lakes, rivers,
  and terrestrial and aquatic animals

				
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posted:6/4/2012
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