5.1 Nature of pollution. Pollution The contamination of air, water, or soil by substances that are...
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Transcript of 5.1 Nature of pollution. Pollution The contamination of air, water, or soil by substances that are...
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5.1 Nature of pollution
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PollutionThe contamination of air, water, or soil by
substances that are harmful to living organisms.
Pollution can occur naturally,(ex. through volcanic eruptions), or unnaturally (ex. the spilling of oil and disposal or industrial waste)
Two Types of Pollution: Point source pollution and non-point source
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Point Source PollutionPoint source: Pollution that can be traced
back to a single origin or source (ex. sewage treatment plant discharge).
Point source pollution has a localized impact is easier to manage.
Can be challenging because it is more scattered and can be very numerous
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Non-Point Source PollutionNon-point source: Pollution which cannot
be traced back to a single origin or source (ex. storm water runoff, water runoff from urban areas and failed septic systems).
More difficult to identify and manage Hard to assign responsibility
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Point source or non-point source?
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Sources of PollutionFossil fuels - release greenhouse gases, can
contribute to respiratory problems and acid rainDomestic waste - food waste, sewage, rubbish
(glass, plastics, paper, wood, metals) Industrial waste - heavy metals, heat (in air
and/or water), acidsAgricultural waste - fertilizers, animal waste,
and pesticides contaminate water sources
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Non-point source pollution
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Sources of PollutionCombustion of Fossil FuelsDomestic Industrial WasteAgriculture Systems
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The Era of Fossil FuelsFossil fuels: petroleum, natural gas and coalCurrently 90% of current US energy from fossil
fuelsExpected oil production peak:2020-2030Consumption of energy currently increasing Projected world oil production will be exhausted by
2100Produces significant and diverse pollution
problemsGreenhouse gasesGaseous sulfur and nitrogen oxidesLand-based disturbances
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What is crude oil?Crude oil is a liquid mixture of thousands of
organic chemicals found underground. Result of decaying organic matter over
thousands of years (fossil fuel)Found all over the world and varies
tremendously in its density, sulfur and metals content
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Oil Refinery and the BP oil rig
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The Refinery
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World oil reserves
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CoalCoal provides 25% of world’s
commercial energy; 22% of U.S. energy
Advantages:Worlds most abundant fossil
fuelCheap
Disadvantages: Dangerous to mine,Harms land, water and airCauses smog, acid rain and
global warming
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World Coal Reserves
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Health impacts131 million
Americans live in areas with smog pollution
Over 45,000 lives are cut short by air pollution
It is estimated that every year 60,000 children may be born at significantly increased risk of neurological defects due to mothers eating mercury contaminated fish.
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Mercury Contamination
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Oil Spills31,000 gallons of spilled oil into waterways
each dayBetween 1973 and 1993 there were
200,000 oil spills in the U.S. waters spilling more than 230 million gallons of oil
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Land DestructionMountaintop removal in west Virginia
(for coal)Tens of thousands of coal bed
methane wells in Powder river basin in Wyoming.
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Global WarmingOnly 4% of world population produces 25% of
the carbon dioxide pollutionProjected that the Earth’s surface
temperature will increase between 2.5 and 10.4 degrees F by 2100 if no major efforts are taken to reduce carbon emissions