Chapter 18 Fossil Fuels and the Environment. Fossil Fuels Forms of stored solar energy created from...
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Transcript of Chapter 18 Fossil Fuels and the Environment. Fossil Fuels Forms of stored solar energy created from...
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Chapter 18
Fossil Fuels and the Environment
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Fossil Fuels
Forms of stored solar energy created from incomplete biological decomposition of dead organic matter
Buried (swamp-like environment) and oxidized
• Crude Oil• Natural Gas• Coal
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Crude Oil• Crude Oil
– Naturally occurring petroleum, normally pumped from wells in oil fields (primary production)
• secondary production: steam or CO2 injected to push oil up
– Refinement of crude oil produces most of the petroleum products we use today
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Natural Gas
• Natural Gas– Naturally occurring
gaseous hydrocarbon generally produced in association with crude oil or from gas wells
– An important efficient and clean burning fuel (cleaner than oil) commonly used in homes and industry
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Oil in the 21st Century
• The U.S has an energy problem caused by dependence on fossil fuels, especially oil
• Maximum global production is expected between 2020 and 2050
• The challenge is to plan for the decline in oil supply and shift to alternative energy sources
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Methane Hydrates
• White ice-like compound made up of molecules of methane gas
• Trapped in “cages” of frozen water in the sediments of the deep seafloor or within areas of permafrost
• “transitional” fuel source– combustion produces less CO2 than
conventional fossil fuels
• Coal-bed methane
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Environmental Effects of Oil and Natural Gas
• Recovery: damage to fragile ecosystems, water and air pollution, land subsidence, and waste disposal
• Refining: soil, water and air pollution• Delivery and Use: energy to power
automobiles, produce electricity, etc.
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Arctic National Wildlife Refuge
• Pristine wilderness area in Alaska with large oil reserve
• Favor of:– oil is needed– create jobs– new tools and
drilling practices means less impact
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Arctic National Wildlife Refuge
• Against drilling:– should remain as a
wilderness– ice roads require
much water from ponds
– heavy vehicles will scar the open tundra
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Coal
• Solid, brittle, carbonaceous rock that is one of the world’s most abundant fossil fuels.
• Classified according to energy content as well as carbon and sulfur content– low sulfur coal emits less sulfur dioxide, so
more desirable– high sulfur coal: acid rain (burned) and acid
mine drainage (water in mines)
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Coal Mining and the Environment
• Strip Mining– A surface mining
process in which the
overlying layer of
soil and rock is
stripped off to reach
the coal-acid mine drainage
-erosion
-sediment pollution
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• Underground Mining– Associated with environmental problems
including acid mine drainage, land subsidence and coal fires
- spoil piles
- mine collapse
- mine fires
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• Transport of Coal– freight trains; coal-slurry pipelines
• The Future of Coal– 90% of fossil fuel reserves– Scrubbing: removes sulfur dioxides; lower
temperature (reduce air pollution)
• Allowance Trading– Reduces pollution– EPA grants utility companies tradable
allowances for polluting
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Oil Shale and Tar Sands
• Oil Shale– A fine-grained sedimentary rock– exceeds global reserves of oil– The oil is a synfuel– requires much energy to extract and make
usable; not competitive with cost of crude oil or other conventional fossil fuels
• Tar Sands– Sedimentary rocks or sands impregnated with
tar oil, asphalt or bitumen