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Global Warming

Chapter 20, Environmental Science (Botkin, Keller)

QuestionAnswer
Increase in average temperature .2 degrees C per decade
Climate Average weather over time
Atmosphere Nitrogen, Oxygen, Argon, Carbon Dioxide, Water Vapor
Where does weather occur? Troposphere
What does the Stratosphere do, and where does it occur? Protects against UV radiation, occurs above the troposphere
What does low pressure bring? Clouds
What does high pressure bring? Clear skies
Atmospheric processed Pressure, temp, and water vapor content
Radiation that reaches Earth Infrared (invisible wavelengths)
How much radiation does the Earth reflect, and how much is absorbed? 30% reflected, 25% absorbed
Trace Gases CFCs, CH4, O3, N2O
Negative feedback Warm temps warm the air, which leads to evaporation, which leads to cloud formation, which cools the Earth
Positive feedback Warm temps warm the air, which leads to water vapor (greenhouse gas) which keeps warming
Milankovitch Cycle Explains why the climate changes, Earth is like a wobbling top
#1 Milankovitch Cycle 26,000 years. Poles are not at a constant angle
#2 Milankovitch Cycle 41,000 years. Tilt of wobble varies
#3 Milankovitch Cycle 100,000 years. Elliptical orbit around the sun changes
Empirical appraoch Looking at the past for information
Rise in sea level 1 ft. per century
Sea ice coverage declination 10.7% per decade
Biological Diversity 2-20% of species will become extinct
Anthropogenic Emissions 20% comes from burning forests
Major approaches International agreements, carbon trading
Created by: tornquiste
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