global warming & air pollution. what is global warming? *an increase in the average temperature...
TRANSCRIPT
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Global Warming
& Air Pollution
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What is Global Warming?*An increase in the average temperature of the Earth
*Recent debate, but has been looked at by scientists for centuries
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Larson B ice shelf, January 2002 Larson B ice shelf, March 2002
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What causes global warming?
• Natural Impacts-
*Volcanoes
*Water vapor
*clouds
*Change in sun’s energy output
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What causes it?
CO2
methane
nitrous oxide
fluorinated compounds
Greenhouse Gases:
Human Impacts-
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Greenhouse Effect
• Greenhouse gases impede the escape of heat from Earth’s surface
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Who’s Responsible?
• Burning of fossil fuels is a main cause
• U.S. is leader in greenhouse gasses
• Human impacts are changing the composition of the atmosphere
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What are Causes of Global Warming?
Air Pollution
What is air pollution?-The presence in the air of substances which pose a potential threat to human health and/or the environment.
-The presence of particles in the air which decrease visibility
-The U.S. EPA estimates that 50 percent of the U.S. population is exposed to air pollutants exceeding current federal standards.
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Sources and Types of Air Pollution
Energy production from fossil fuels
- Carbon dioxide, sulfur oxides, particulates
- Increase in greenhouse gases, acidic precipitation
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Sources and Types of Air Pollution
Automobiles, other transportation sources
- Carbon dioxide, nitrogen and sulfur oxides, products of incomplete combustion - Increase in greenhouse gases, acidic precipitation
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The Carbon Cycle
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CH4 (methane)
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Fig1
N2O (nitrous oxide)
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Sources and Types of Air Pollution
Refrigeration devices including home, commercial, and vehicles - Chlorofluorocarbons
- Destruction of the stratospheric ozone layer
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The ozone layerAbsorbs UV radiation, preventing much of it from contacting organisms in the biosphere.
Has been thinning since 1975 because of the accumulation of chlorofluorocarbons.
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CFCs (chlorofluorocarbons)
Note that CFC increase stopped after 1995!
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Effects of Air Pollution and Global Warming
-Rising Sea Level
-Change of precipitation and local climate conditions; acid rain
-Alteration of forests and crop yields
-Expansions of deserts into existing rangelands
-More intense rainstorms
-Not all long-term effects can be determined
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Air Quality Air Quality Index (ppm) Protect Your Health
Good 0-50 No health impacts are expected when air quality is in this range.
Moderate 51-100 Unusually sensitive people should consider limiting prolonged outdoor exertion.
Unhealthy for Sensitive Groups
101-150 Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
Unhealthy 151-200
Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion, everyone else, especially children should limit prolonged outdoor excertion.
Very Unhealthy (Alert) 201-300 Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion everyone else, especially children, should limit outdoor exertion.
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Alternatives
http://www.snre.umich.edu/greendana/images/solar_array_southfield.jpg
http://cs.baylor.edu/~forbes/personal/joshuatree/wind-generators.1.jpg
Renewable Energy Sources
Solar EnergiesWind Power
http://www.wrenuk.co.uk/images/biomass.jpg
Biomasshttp://www.ca.blm.gov/news/images/geothermal.gif
Geothermal
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Changes In Vehicle Systems
Hybrid
Fuel Cell
Battery-Electric
http://autozine.kyul.net/technical_school/engine/tech_pic_eng_prius.jpg
http://www.redjellyfish.com/newimages/merlin.jpg
http://www.evworld.com/archives/testdrives/carpicts/ecom_sm.jpg
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Comparative Costs of Renewable Energy Technologies
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Conclusion
• Responsibility to improve environmental conditions lies upon all of us as individuals
• Concentrate on preventing environmental degradation before it starts
• Alternatives ARE feasible and CAN be used
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