Global Warming – Climate Change



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A Tale of Three Planets

  • Neighboring planets (Mars, Venus) can provide us with a “greenhouse experiment”
  • Comparison of Temps – No Atmosphere
    • Mars: -90 F; Earth: o F; Venus: 110 F
  • Comparison of Temps – With Atmosphere
    • Mars: -120 F; Earth: 60 F; Venus: 500 F (melt lead)
  • Comparison of Atmospheres
    • Mars: 1% (.01) of Earth’s density; Cooler – reflects heat
    • Earth: 1.0 density – provides normal greenhouse effect
    • Venus: 100 times Earth’s density – 96% is CO2; All water is evaporated – powers greenhouse effect; CO2 - permanent

The Human Factor

  • Three factors affect temps – two are natural, one is us
  • 1. Volcanoes
    • Throws dust into air; forms clouds; decreases temps
  • 2. Sun
    • Burn rate varies; distance from Earth; tilt of Earth axis
  • 3. Anthropogenic – caused by humans
    • Burn fossil fuels – increases CO2 in atmosphere
  • Other factors
    • Methane (minor); Aerosals – particles in air
  • Why blame us?
    • Strong correlation – CO2 , higher temps; Natural causes - varying effects; Dominant correlation in recent decades has been anthropogenic

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