ENERGY & THE ENVIRONMENT
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Transcript of ENERGY & THE ENVIRONMENT
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ENERGY & THE ENVIRONMENT
Unit Review
Updated 12/6/2013
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Contents
Electricity Fossil Fuels
Alternative Energy Environment
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Creating Electricity
Flow of electrons = electricity Generator spins copper coil inside magnets knocking
loose electrons
A loop of wire spinning through a magnetic field will create an alternating current. Note: current will flow only if the circuit connected to the generator is complete.
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Creating Electricity: Methods
Heat (makes steam and drive turbines): fossil fuel combustion, solar heat, nuclear reaction
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Creating Electricity: Methods
Mechanical: hydroelectricity, wind turbines
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Creating Electricity: Methods
Solar light: photovoltaic cells (PVCs)
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Fossil fuels
Highly concentrated carbon sources Plants and animals decayed millions of years ago Reliance is dangerous
Running out of resources Causes high levels of pollution Often from unstable or unfriendly governments
Coal Natural GasOil
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Coal
Dirty, about 35% efficiency Huge formations in U.S., Russia, China Most electricity in China from coal, polluting U.S.
World coal reserves
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Types of Coal
Anthracite (in Appalachia) Bituminous (large reserves in IL, WY) Sub-bituminous Lignite Peat
HARDEST
SOFTEST
Strip mining
Underground mine
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Oil
Formed from algae buried in sediment and cooked U.S. supply sources: Canada, Mexico, Saudi Arabia,
Venezuela
World oil reserves
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Non-fuel petroleum products
Plastics Fertilizer Asphalt Cosmetics Medicine Clothing (polyester,
nylon, polypropylene)
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Natural Gas Forms above oil bearing rock Promoted as substitute for other fossil fuels Emits about 50% less carbon than oil or coal
World natural gas reserves
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Uses of Natural Gas
Power plants Domestic
Cooking Heating
Fertilizer Transportation
CNG, LNG Making hydrogen fuel
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Alternative power sources
Nuclear Wind
GeothermalWater
Solar
Biofuels
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Nuclear Energy
Earliest use = weapon Nuclear reaction creates heat
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Nuclear Reactions
Fission = splitting of atoms; primary method for nuclear energy use
Fusion = joining atomic nuclei to make heavier atoms, releases excess matter as energy
FUSION
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Nuclear Fuels
Uranium: mined & refined Plutonium: produced from uranium MOX (mixed oxide fuel): recycled nuclear waste
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Advantages of Nuclear Energy
Long-lasting, more predictable Clean and efficient, environmentally friendly Cost effective, a lot of energy is produced quickly
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Disadvantages of Nuclear Energy
Operational issues Plants are more expensive than solar or wind farms Expensive to decommission Radiation containment, waste disposal
Potential problems Shortens life, causes cancer, damages genetics Plutonium (optional fuel) can be used in weapons Nuclear accidents can be catastrophic
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Solar Energy
Types Light: Photovoltaic cells (PVC) convert light to electricity Heat: Solar ponds, solar collectors (mirrors) collect heat
Best place Lots of sunshine, open environment, warm climate (ponds) Good example: greenhouse
Uses: heating, cooling, light, electricity
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Advantages of Solar Energy
No harmful effects to humans/environment Can be used in space
Installing major solar arrays in the marked locations would supply all the world’s energy needs.
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Disadvantages of Solar Energy
Not all parts of the world are reliably sunny PVCs are not very powerful nor efficient Limited infrastructure
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Using Solar Energy
Passive Shine on walls for radiant heat Natural light
Active Store PVC energy in batteries Heat water Pump to other areas
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Wind Energy
Early uses: grinding corn, pumping well water
Preparing blades for installation
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Wind
Advantages: free, unlimited source Disadvantages
Need constant winds between 10 and 30 mph. Danger to birds Wind farms take a lot of space (no shadowing) Noisy
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Hydroelectric
Potential energy converted to kinetic energy
Grand Coulee Dam, WA
barrage
wavesdam
pumped storage
tidal exchange
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Advantages of Hydroelectricity
Low operating cost (fuel) Flood control No combustion pollution Gathers water for tourism & agriculture
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Disadvantages of Hydroelectricity
Needs lots of moving water
Failure risk Lack of public
support Fish need
ladders Decomposing
vegetation creates greenhouse gases (new dams)
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Geothermal
From Earth’s mantle
Used for hot water, heating, electricity
Near surface in limited areas
Can be depleted
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Biomass Sources
Plant, wood and animal waste (agricultural waste, landfill gases)
Organic oils Forest byproducts Certain crops
Corn Sugar cane Soybeans Switchgrass
switchgrass
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Creating Biomass
Fertilizer Needed to increase
production Run-off pollutes rivers
Food vs. Fuel Prices may be better
for fuel use than food Not enough arable
land to support both uses
Natural crop failures increase problem
Deforestation: cutting down rainforest for arable land
2000200320052008
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Biofuels
Ethanol: mixed with gasoline in some states Methanol: used in race cars Biodiesel: used only in diesel engines
Some cars Large trucks Farm machinery
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Environment
Smog Greenhouse Gases
Global WarmingGreenhouse Effect World Efforts
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Smog
Smog Partially burned fuels (smoke) + atmospheric moisture (fog) Photochemical smog: sunlight interacting with air pollutants. Industrial smog: burning hydrocarbons
New York City
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Greenhouse Gases
Primary Carbon dioxide (CO2)
Methane (CH4)
Nitrogen oxide (NO)
Secondary Water vapor Ozone Chlorofluorocarbons Others
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Greenhouse Effect
Greenhouse gases in stratosphere let sun’s heat in, keeps radiation out
Natural occurrence, makes life on Earth possible
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Global Warming
When Greenhouse Effect keeps in too much heat Gases thicken stratosphere, damage ozone layer Not enough heat can escape Earth gradually warms
Only 2° global increase will: Melt ice caps Flood low lying areas Cause deforestation Decrease arable land
Reduction Drive less; use public transportation, walk, carpool Reduce use of gasoline powered machines, pesticides, chemical
solvents, other polluting technology
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World Efforts
U.N. Framework Convention on Climate Change Kyoto Protocol (1997) Global pollution reduction plan US didn’t ratify
U.N. Intergovernmental Panel on Climate Change Paris 2007
Scientists reported that Global Warming is being accelerated by human activity
Governments must now take action
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Nuclear
Solar heat
toaster
• efficient• non-renewable• pollution
• renewable• limited
house wiring power lines transformer
heat water
power plantgeneratorturbine
compressed steam
Water = hydroelectricity
Wind = wind turbines
CombustionCoalOilNatural gasBiofuels
Solar light
(PVC)
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Fossil Fuel Formation
Age MYA Fuel Type Flora/Fauna Land Development
Carboniferous
300 Bituminous & anthracite
Thick-barked trees (lignin) resisted decay & consumption by animals, fell & fossilized to coal
Pangaea formed
Jurassic 200 - 145 (no fuels formed) Age of dinosaurs Pangaea breaks into Gwandanaland & Laurasia
Cretaceous 145 - 65 Sub-bituminous, tar sands, oil shale
Mammals appear, age ended w/mass extinction; sediment in shallow seas led to oil & gas formation
Gwandanaland breaks up, Laurasia begins to form N. America, Europe & Asia
Eocene 33 – 55 Brown coal & lignite, crude oil
Neogene 5 - 23 Crude oil Formed in Venezuela, Russia, N. Africa, Mid East
Pleistocene .12 – 2.5 Humans appear Continents in modern position, repeated ice ages
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Oil Consumption/Capita
Darker colors show higher consumption
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Nuclear Incident Levels
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When Disaster Strikes
Chernobyl 1986(Ukraine)
3-Mile Island 1979(Pennsylvania)
Fukushima 2011(Japan)
Human error during testing, explosion
Failure of reactor coolant, meltdown
Tsunami after earthquake, damaged fuel storage
Level 7 Level 5 Level 7
30 people died within 2 weeks
No one died Radiation injuriesNo one died
Nearby towns evacuated permanently
5 mi. radius evacuated temporarily
12 mi. radius evacuated temporarily
Land quarantined for about 2700 sq. mi.
U.S. nuclear plant safety questioned
Natural disaster and operator errors
Last reactor closed 2000 Tourism started 2011
Second reactor resumed operation in 1985
Clean-up will take up to 40 years
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Sharing the Disaster
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Available Wind Resources
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Kyoto Protocol Ratification
Parties; Annex I & II countries
with binding targets
Parties; Developing countries without binding targets
States not Party to the Protocol
Signatory country with no intention to ratify the treaty, with no binding targets
Countries that have renounced the Protocol, with no binding targets
Parties with no binding targets in the second period, which previously had targets
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Global Carbon Emissions