Global Changes in the Atmosphere

1
Global Changes in the Atmosphere
2
Global Warming

• Global Warming- the gradual increase in the
  temperature of Earths atmosphere
• Greenhouse Effect-
• Greenhouse Effect- the ability for gases to hold
  in heat and keep the atmosphere warm
• Greenhouse Gases- Water Vapor Carbon Dioxide
• Human activities that add greenhouse gases to the
  atmosphere may be warming Earths atmosphere
• Burning of wood, coal, oil and natural gases add
  CO2

3
Global Warming

• Another Hypothesis
• Natural climate variations (a natural cycle
  caused by changes in solar output)
• Possible Effects
• Longer growing seasons
• More evaporation drying out soil-gt dust bowls
• More storms
• Rising sea levels due to ice caps melting-gt
  flooding

4
Ozone Depletion

• Chemicals produced by humans have been damaging
  the ozone layer
• Chlorofluorocarbons (CFCs)- complex chlorine
  compounds found to destroy ozone molecules
• Found in air conditioner and refrigerator
  coolants, some cleaners and spray cans
• In the late 1970s the U.S. banned the use of
  CFCs in spray cans
• Effects-gtmore UV rays reaching the surface and
  causing more eye and skin damage