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Chapter 6 Humans in the Biosphere. Section 6-4 Charting a Course for the Future. Charting A Course. Key Concept: As We Enter The 21 st Century, Many Biologists Are Concerned About The Biological Effects Of Two Types Of Global Change: The thinning, or depletion, of the ozone layer

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chapter 6 humans in the biosphere

Chapter 6Humans in the Biosphere

Section 6-4

Charting a Course

for the Future

charting a course
Charting A Course

Key Concept:

As We Enter The 21st Century, Many Biologists Are Concerned About The Biological Effects Of Two Types Of Global Change:

  • The thinning, or depletion, of the ozone layer
  • Global Warming
ozone depletion
Ozone Depletion
  • Ozone layer
    • 20/50 km above earth (12 – 31 miles)
    • Oxygen = O2
    • Ozone = O3
      • Ozone at ground level is a pollutant
      • In the upper atmosphere it is VERY important
ozone layer
Ozone Layer
  • Absorbs Ultraviolet Radiation (UV)
  • UV Radiation Can Cause:
    • Sunburn
    • Cancer
    • Eye Damage
    • Cataracts
    • Decreased Resistance To Disease
    • Destruction of Plants & phytoplankton
ozone
Ozone

The Universal Sunscreen

slide8

Ozone Hole

-

South Pole

ozone depletion9
Ozone Depletion
  • Discovered in 1970’s over Antarctica
  • Hole is growing larger
  • Now occurring over the Arctic
  • 1995
    • grew large enough to expose U.S.
ozone hole caused by
Ozone Hole Caused By

CFC’s

Chlorofluorocarbons

CFC’s act as a catalyst

CFC’s have a long half-life

2O3 + CFC’s 3O2

where do cfc s originate
Where Do CFC’s Originate?
  • CFC’s found in
    • aerosol cans
    • coolants used in
      • refrigerators
      • freezers
      • automobile air conditioning
montreal protocol
Montreal Protocol

1987

46 Nations

Agreed to end use of CFC’s by 2000

climate change
Climate Change
  • Any Climate Change will have profound effects on the Biosphere.
  • Over past 120 years average global temperature has increased 0.5 degrees Celsius (0.9 degrees F)
  • Rise between 1980-2000 fastest in over 100 years.
climate change18
Climate Change
  • Ice caps are melting
  • Artic Sea Ice may be gone in 50 years
why is it happening
Why is it happening?
  • CO2 Methane (Greenhouse Gases)
  • Burning Fossil Fuels, Forests
  • Project Increase of 1 – 2 degrees Celsius by 2050
    • BUT, Some scientists wonder if this is not a natural cycle.
global warming effects
Global Warming Effects
  • Polar Ice Melt
  • Rising Sea Levels
  • Increase in number & severity of storms
  • North American droughts
  • Shifts in plant & animal species distribution
ways to help the biosphere
Ways to Help the Biosphere
  • Decrease energy consumption
    • Insulate Homes
    • Energy Efficient Appliances
    • High Mileage Cars
    • High Efficiency Energy Production
  • Alternate Fuel Sources
    • Fuel Cells
    • Wind