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  • Earth Under Pressure
    • How well is our Planet?
      • Global Warming
        • Causes
          • CO2 emmisions
          • Deforestation
        • Consequence
          • Rising sea levels
          • Temperature increase
          • Melting of Arctic and Antarctica
      • Poverty
        • Causes
          • overpopulation
          • inequalities
          • illeterate
        • Consequence
          • Can't learn how to care for environment - no schools
          • jobs that cause destruction
      • Overpopulation
        • Causes
          • illeterate
          • Cultural beliefs
        • Consequence
          • More land & natural resources taken up
          • More illiterate people
      • Deforestation
        • Causes
          • demand for timber
          • More land needed
        • Consequence
          • need trees for oxygen
          • destroys widlife
          • more greenhouse gases
      • Polltution
        • Causes
          • nonrenewable
          • illeterate
          • not enough space in landfills for rubbish
        • Consequence
          • toxifys drinking water
          • slowly destroys planet
    • World Biomes
      • Polar
        • Permanently cold
        • Continuous darkness 4  months
        • Temperature up to -70 degrees
      • Tundra
        • Sun does not set
        • Absence of trees marshes and grass
        • Not enough sun energy to grow trees
      • Boral Forest
        • Supports really little animal life
        • 1/3 of trees in the world
      • Deciduous Forest
        • Characteristic
          • longer summers= broader leaves= longer life 4 animals
          • migration & hibernation common 4 winter
        • Issues/threats
          • hunting and habitat destruction = animal extinction
      • Tropics
        • All year around summer warmth
        • Contains 50% of plants and animals
      • Desert
        • Characteristic
          • Covers 1/3 of land
          • dust storms
        • Issues/threats
          • Get bigger every year- threaten to take over
    • Population Exploded
      • Population grew slowly
        • Death from disease and hunger equaled birth
        • People had to work hard to survive
      • Population growth rate is faster than death rate
        • Educated people began to understand science
        • Link with bacteria & disease discovered
        • Hygienic health measures discovered
        • Fewer children died of disease & people lived longer
      • People are wealthy and population growth is slow.
        • Birth control measures widely used
        • Fewer children= more comfortable lifestyle
        • Both death & birth rates low
        • Well educated
      • Overcrowding & starvation common & pop. grows
        • Fewer children die b/c health measures from wealthy countries
        • More food & fuel needed 2 feed extra people
        • Land over-cropped & over-grazed & forests cut down for fuel
        • Fewer trees= less rain droughts occur
        • Country people move to cities
        • People are poor & no education
        • For poor families children are seen as sercurity for the future
    • Greenhouse effect
      • Natural
        • (1) sun radiating heat to Earth
        • (2) Most of the heat is absorbed by earth some reflected by clouds and atmosphere into space
        • (3) This heat energy that is emitted back into space is trapped and keeps our planet temperature sustainable
      • Modified by humans
        • (4) Since Industrial Revolution large amounts of greenhouse gases released into atmosphere
        • (5) More greenhouse gases = more heat trapped
        • (6) "Enhanced Greenhouse Effect" Earths temperature warming 0.5 degrees last century.
        • (7) in the future environment impact - ice melting, sea rising and climate change
    • Greenhouse gases
      • Carbon Dioxide
        • Transport
        • Television
        • Industry
        • Fire
        • Logging
        • Coal fired power
      • Nitrous Oxide
        • Fertiliser
      • Methane
        • Sheep
        • Cow
        • Rubbish/waste
        • Grass Clippings
    • Possible Impacts on New Zealand
      • Tropical cyclones threaten homes, roads and businesses
      • Heatwaves in Alexandra
      • Fire and drought rainfall decrease 20%
      • Forestry industry- increased tree growth but pests & water shortages may occur
      • Increased rainfall events means storm water infrasturture needs upgrade - rate payers
      • changing ocean currents and temperature impact on fish stock
      • Increased coastal erosion and salinity of low lying areas
      • Threaten glaciers
      • Bio-diversity of alpine areas may be threatened
      • Weeds like Kikuyu increase b/c of increased temperatures
      • Dengue and Ross River Virus increased risk
      • Kauri may face extinction

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