Not all pollution is caused by people however until

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Unformatted text preview: n steel making. 36 US Nonmetallic Mineral Production Principal US States for production of selected nonmetallic minerals. Note that some nonmetallic minerals (crushed stone, Portland cement, lime, sand and gravel, etc.) are produced just about everywhere! 6 37 Pollution 38 When more waste is added than a resource can accommodate, we have pollution. Not all pollution is caused by people; however, until we can control volcanoes, we are going to worry about the things we are responsible for: We can talk about air pollution in terms of three scales: global, regional and local. Global air pollution problems: – Global warming – Ozone damage – Air pollution – Water pollution – Land pollution (waste disposal) Regional air pollution problems: – Acid deposition When it comes to managing pollution there are two types of sources: point and non-point. Point are far easier to control. 39 41 Global-Scale Air Pollution: GlobalClimate Change There is no question that earth’s climate has changed over time There is also no question that people have been adding large quantities of certain gases and particles to atmosphere for the past 250 years. The question is: Does what we do seriously affect the earth’s climate? Greenhouse Gasses There are a lot of gases that are good at holding in the heat: – – – – H2O (Water vapor) CO2 (Carbon dioxide) CH4 (Methane) N2O (Nitrous oxide) These are all gasses that we have been putting into the atmosphere. Air Pollution Local air pollution problems: – Smog 40 Factors Affecting Climate Change Greenhouse Gasses (CO2, CH4, etc.) Atmospheric aerosols (soot, dust) Cloud changes Land cover changes Variations in the sun’s output Volcanic aerosols 42 Our Contribution “Since the beginning of the industrial revolution, atmospheric concentrations of carbon dioxide have increased nearly 30%, methane concentrations have more than doubled, and nitrous oxide concentrations have risen by about 15%.” Environmental Protection Agency “The observed patterns of [cli...
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