Section 11-3 Global Warming

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Section 11-3 Global Warming

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The Earth is like a Greenhouse

• The atmosphere contains greenhouse gases such as
  water vapor, carbon dioxide, chlorofluorocarbons
  (CFC), methane and nitrous oxide.

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Measuring Carbon Dioxide

• You need a place
• Far from most sources
• Where there is wind
• Where the Carbon Dioxide is mixed well in the air
• Mauna Loa

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• Most is absorbed by ocean
• Or used by plants for _______________
• Why does it decrease in summer and increase in
  winter?

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• Since 1958 the
• Carbon Dioxide levels have been
  __________________
• Highest in _________ years

420,000
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Global Warming
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• What does the graphic tell us about the average
  temperature of Earth?

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Consequences

• Melting Ice and Sea Levels
• 20-200 feet
• Less reflected light and more absorbed

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• Global Weather Patterns
• Very hard to predict
• Heat fuels storms
• More heat stronger storms

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• Human Health
• Heat related, allergies
• Disease vectors spread
• Ex Malaria

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Agriculture

• Extreme weather events more frequent
• Wipes out crops
• Less water more pumping of aquifers

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Reducing the risk

• Even if you disagree with the concept of Global
  Warming
• Reducing emissions is a positive action

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Kyoto Protocol

• Reduce greenhouse emissions to 5 below their
  1990 by 2012
• US would not sign