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FOSSIL FUELS 85% of the world’s commercial energy COAL OILNATURAL GAS
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20 richest countries consume: 50% of coal 80% of natural gas 65% of oil
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U.S. energy consumption 9%
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COAL Fossilized, condensed carbon-rich fuel 10 X reserves of oil/gas, last 200 years at present rate
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Coal mines Surface (strip) mine, Western U.S. Underground (shaft) mine, Eastern U.S.
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Coal cheaper, but polluting Much Eastern U.S. coal has high-sulfur content, more expensive to mine Much Western U.S. coal has low-sulfur content, cheaper to mine But mining in semi-arid West more damaging to land.
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Heat value of coal types Anthracite Bituminous Subbituminous Lignite 51% of U.S. use in coal
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Energy lost from coal 10% lost on transmission lines (stray voltage) 65% lost in power plants
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Effects on health Black Lung Disease (miners) Respiratory illnesses (public)
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Effects on land Coal sludge releases Hardpan at strip mines Mountaintop removal Huge water use –Slurry pipelines
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Effects on air Greenhouse gases –3/4 sulfur dioxide –1/3 nitrogen oxides –1/2 carbon dioxide Toxics –Mercury –Uranium
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Acid rain
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Acidity of rain pH of 6.0 –Kills insects, crabs pH < 5.0 –Kills fish, trees
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Sources of Nitrogen Oxides Nitrogen oxides and sulfur dioxide create acid rain Tall stacks deposit farther
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Coal scrubbers
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The future? Hydrogen fuel cells
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NATURAL GAS Methane, other Gases in bedrock
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Advantages of natural gas Cleaner to burn –Half as much CO2 as coal More efficient –10% energy lost 60-year supply at current rates
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Disadvantages of natural gas Difficult to transport –Pipelines –Liquified Natural Gas (LNG) tankers Can be polluting, dangerous when extracted Methane bed drilling pollutes
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OIL (PETROLEUM) Buried organic matter rich in hydrocarbons
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Oil Consumption by Sector (1998)
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Proven oil reserves 465 billion barrels consumed 1 trillion barrels left 22 billion consumed a year 45 years to go! Party now!
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1800 2200 2600 Global Oil Production for Resources of 1800, 2200, and 2600 Billion Barrels
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Distribution of Estimates of Ultimately Recoverable World Crude Oil (1975-1993)
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World Crude Oil Production
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World Crude Oil Prices (economic crises in oil states)
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Global trends in oil Growing use in China (+10%/year) Japan, Europe depend on Mideast New reserves around Caspian Sea –Nearly size of Saudi Arabia Increasing source of major wars, human rights abuses
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Kuwait oil well fires, 1991
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Persian Gulf and Caspian Sea
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Oil & natural gas pipelines
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U.S. trends in oil Diverse sources (not Mideast) –Venezuela, Nigeria, etc. Opening domestic sources –Alaska controversy Polluting technologies? –Oil shale extraction –Synthetic fuels (coal-to-oil)
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Exxon Valdez, Alaska 1989
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Attempts to contain spill
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Clean-up efforts
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Prince William Sound fishing industry damaged
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Oil in Ecuador Ecuador 2nd largest S. America producer –70% of exports Drilling in Amazon rainforest
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Opposition to oil companies Construction of roads, pipelines on Indian lands Displacement of Indians, deforestation Oil leaks into rivers larger than Valdez spill
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Ecuador Indian occupations Texaco withdrew 1992, Arco met demands Lawsuit against Texaco in U.S. courts, 1999
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Oil in Nigeria Largest producer in Africa, mainly In Niger Delta Nigeria had military governments in 1990s
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Environmental problems in Niger Delta region Homeland of Ogoni, Ijaw groups Gas flaring hazards Oil spills in mangrove swamp
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Ogoni environmental protests
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Oil companies collude with military Many Ogoni killed by military Ogoni leader Dr. Ken Saro-Wiwa executed in 1995 Shell Oil pays, transports soldiers
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Nigerian women protest, 2002 Protest against pollution, lack of local jobs Ijaw women occupy Chevron oil docks
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Websites on oil industry and global opposition Rainforest Action Network http://www.ran.org Project Underground http://www.moles.org
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