1 Energy and the Environment HNRT 228 – A Recap Spring 2013 Prof. Geller.
1 Energy and the Environment HNRS 228 – An Overview Spring 2011 Prof. Geller.
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Transcript of 1 Energy and the Environment HNRS 228 – An Overview Spring 2011 Prof. Geller.
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Energy and the Environment
HNRS 228 – An OverviewSpring 2011Prof. Geller
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Concepts For Understanding Energy
WorkPotential EnergyKinetic EnergyConservation of EnergyTypes/Sources of Energy
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Work is Force times distance
Definition of work “work is equal to the force that is
exerted times the distance over which it is exerted”
work in Joules =force in Newtons * distance in meters
W = f * d
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Question for Thought
A spring clamp exerts a force on a stack of papers it is holding together. Is the spring clamp doing work on the papers? A Yes B No
If the spring clamp does not cause the paper to move, it is not acting through a distance and no work is done.
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Power - Work per unit time
Power defined “power is the amount of work done
divided by the time it takes to do that work”
power in Watts = work in Joules / time in seconds
P = W / t
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Question for Thought
A kWhr is A a unit of work B a unit of energy C a unit of power D More than one of the above is true.
A kWhr is a unit of work, and since energy is the ability to do work, it is also a unit of energy. In terms of units, a watt is a joule per second, and an hour, as a second, is a unit of time. The time units cancel, leaving a unit of a joule, which can be used to measure either work or energy.
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Kinetic Energy
Definition “Kinetic energy equals the mass of the
moving object times the square of that object’s speed, times the constant 1/2.”
kinetic energy in Joules = 0.5 * mass in kilograms * speed in meters per second * speed in meters per second
K.E. = 0.5 * m * v2
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Question for ThoughtDoes a person standing motionless in the
aisle of a moving bus have kinetic energy? A Yes B No
Relative to the bus, the person has no kinetic energy because the person is at rest relative to the bus. Relative to the ground, however, the person does have kinetic energy because the person is moving with the same speed as the bus.
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Potential Energy
Definition “gravitational potential energy of any
object equals its weight times its height above the ground”
gravitational potential energy in Joules = mass in kilograms * acceleration due to gravity * height in meters
P.E. = m * g * h
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Question for Thought
What happens to the kinetic energy of a falling book when the book hits the floor? A The kinetic energy is destroyed. B The kinetic energy is converted to
heat only. C The kinetic energy is converted to
heat and sound.
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Mass as Energy
Definition “every object at rest contains potential
energy equivalent to the product of its mass times the speed of light squared”
energy in joules = mass in kilograms * speed of light in meters per second * speed of light in meters per second
E = m * c2
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History of Energy Use
Early civilizations used human muscle power as their primary energy source. Energy provided by burning wood
enabled people to cook food, heat living areas, and develop primitive metallurgy.Dense, rapidly growing settlements
outstripped wood production, thus new fuel sources had to be utilized.
• 1890, coal replaced wood - primary energy source
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Fossil Fuels
Carboniferous period, (286-362 Mya) large deposits of plants,
animals, and microorganisms.
Led to the formation of fossil fuel deposits.
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Industrial Revolution - 1875
Industrial Revolution - Machines replaced human and animal labor in the manufacture and transportation of goods. Steam engines converting heat energy into
forward motion was central to this transformation.Countries or regions without large coal deposits
were consequently left behind.
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Industrial Revolution
Prior to the Industrial Revolution, goods were manufactured on a small scale in private homes – master craftsman Expanding factories = larger labor
pools, move to city• 200 years, energy consumption increased 8X
– Increased levels of air pollution.
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iClicker Question
Fossil fuels are derived from biological material produced A at the time of the industrial revolution B about 300 million years ago C about 1 million years ago D about 1 billion years ago E at the turn of the previous century
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Changes in Energy Sources to 2000
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iClicker Question
At the turn of this century (2000) most energy was derived from A Coal B Wood C Natural Gas D Oil E Nuclear Power
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Role of The Automobile
Growth of automobile industry led to roadway construction Better roads - Higher speeds
Higher speeds - Bigger faster cars = Bigger faster cars - Better roads
Convenience of two-car families Job growth in automobile-related industries Major role in development of industrialized nations.
Cars altered people’s lifestyle Greater Distance Travel
Sprawling Cities• Suburbs
Vacations
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Growth in the Use of Natural Gas
Initially, natural gas was burned as a waste product at oil wells. Before 1940, accounted for less than 10%
of energy consumption in United States.By 1970, accounted for about 30% of energy
needs.In 2003 accounted for 25% of U.S.
consumption. Primarily used for home heating and
industrial purposes.
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How is Energy Used?
Industrialized nations use energy for: Residential / Commercial uses Industrial uses Transportation
Less developed countries use most energy for residential purposes. Cooking and Heating
Developing countries use much of their energy to develop industry.
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US use of oil to 2002
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iClicker Question
Oil use in the U.S. has always risen since 1960. A True B False
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How does the US compare to others in overall energy use through 2002?
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Gasoline Taxes and Fuel Cost
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iClicker Question
Which of the following countries has the lowest gas taxes? A France B Germany C Spain D Japan E USA
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The Importance of OPEC
Oil Producing and Exporting Countries
Twelve members Control over 78% of world’s estimated
oil reserves.• 1,000 billion barrels
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Overview of Energy Production/Consumption
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iClicker Question
The United States imports more energy than it produces? A True B False
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Energy Flow from Source to Use(USA 2008)
Note Changes from 2003, page 17 of textbook
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TYPES OF ENERGYand their Transformation
Mechanical, Electromagnetic,
Electrical, Chemical and Thermal
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iClicker Time!Electrical energy is
transported to your house through power lines.
When you plug an electric fan to a power outlet, electrical energy is transformed into what type of energy?
A MechanicalB ElectromagneticC ElectricalD ChemicalE Thermal
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Energy come from Energy Resources, that are converted into energy that we can easily use. Electricity is the main form of energy that we use and can power or charge what we need energy for.
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To generate electricity…
1. You need an energy source, e.g. coal2. This is burnt to produce heat or steam3. The heat or steam then drives a turbine4. The turbine then can drive a generator5. The generator then produces electricity6. The electricity is then transported in cables
to where it is needed
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Energy Resources can be divided into 2 categories:
1. Non-Renewable ResourcesFor example – coal, oil, gas, uranium or ligniteOnce used these resources CANNOT be used again
2. Renewable ResourcesFor example – wind, water or solarThese resources can be used over and over again
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Non-Renewable Resources: COAL
What is it? Formed underground from decaying plant materialHow much left in the world? About 200 yearsAdvantages? Plenty left Mining is getting more efficientDisadvantages? Pollution: CO2 emissions (linked to global warming),
SO2 (linked to acid rain) Heavy & bulky to transport
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Non-Renewable Resources: OIL
What is it? Formed underground from decaying animal and plant
materialHow much left in the world? Estimates vary, but average about 40 yearsAdvantages? Quite easy to transport Efficient in producing energy Less pollution than coalDisadvantages? Not much left Pollution: air and danger of water pollution through spills
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Non-Renewable Resources: NATURAL GAS
What is it? Formed underground from decaying animal and
plant materialHow much left in the world? Estimates vary from 60-100 yearsAdvantages? Clean, least polluting of all non-renewables Easy to transportDisadvantages? Some air pollution Danger of explosions
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Non-Renewable Resources: NUCLEAR
What is it? Uses uranium, naturally found in some rocksHow much left in the world? Not knownAdvantages? Not much waste and few CO2 emissions released, as
well as, few other greenhouse gasesDisadvantages? High cost to build and close down power stations. Waste is radioactive. Problem with getting rid of
waste safely
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Why is the term, FOSSIL FUEL used for coal, oil, gas and lignite?
A Because they all contain fossils.B Because they were once food sources for things that are now fossils.C Because they are derived from living matter of a previous geological age.D Because of their energy per unit of mass.E Because Prof. Geller said so.
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Renewable Resources: WIND
What is it? It the movement of air from high to low pressure
How much left? LotsAdvantages? No pollutionDisadvantages? Winds change all the time, not predictable
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Renewable Resources: SOLAR
What is it? Energy from the sunHow much left? LotsAdvantages? No pollution, can be
used in remote areasDisadvantages? Can be expensive,
needs sunlight At night it doesn’t work
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Renewable Resources: BIO-ENERGY
What is it? Biomass and Biogas – fermented animal or plant wastevegetation from sustainable sourcesHow much left? LotsAdvantages? Good availabilityDisadvantages? Can be expensive to set up
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Renewable Resources: HYDROWhat is it? Movement of water drives a
turbineHow much left? LotsAdvantages? No CO2 emissions, can control
flooding and provide a good water supply to an area
Disadvantages? Large areas maybe flooded. Visual and water pollution
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Renewable Resources: GEOTHERMAL
What is it? Heat from the ground – often used to heat water
How much left? LotsAdvantages? No CO2 emissions
Disadvantages? Expensive and can only be used in certain parts of the world
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Renewable Resources: WATER & TIDAL
What is it? Movement of sea drives turbines
How much left? LotsAdvantages? Can produce a lot of
electricity, no CO2 emissions
Disadvantages? Not many suitable sites
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Energy Transfer
Chemical
Electrical
Electrical
Electrical
Sound(mechanical)
Light(Electromagnetic)
ThermalMechanical
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Oil Exploration and Extraction
Oil is a fossil fuel formed from the remains of plants and
animals died in ancient seas around 300 million
years ago Biota such as plankton fall to the
bottom of the sea and decay form sedimentary layers little or no oxygen present
microorganisms break down the remains into carbon-rich compounds
organic material mixes with the sediments to form fine-grained shale, or source rock
sedimentary rocks layer generate heat and pressure
distilled organic material forms crude oil and natural gas
oil flows from the source rock and accumulates in thicker, more porous limestone or sandstone known as reservoir rock.
When the Earth’s crust moves, the oil and natural gas is trapped in reservoir rocks, which are between layers of impermeable rock (cap rock– usually granite or marble)
http://www.energyquest.ca.gov/story/chapter08.html
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iClicker Question
Oxygen is required in the formation of oil in the sedimentary layers A True B False
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The Search for Oil Oil companies usually
contract out the search for oil to exploration geophysicists
Exploration geophysicists utilize surface features surface rock reservoir rock entrapment satellite images gravity meters magnetometers hydrocarbon sniffers
sometimes called electronic noses
seismometers [most common technique used]
shock waves developed reflections interpreted
Oil exploration methods are still only about 10 percent successful in producing useful well
http://science.howstuffworks.com/oil-drilling2.htm
http://science.howstuffworks.com/oil-drilling1.htm
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iClicker Question
What is the name of a scientist who explores for oil? A oil geologist B exploration geophysicist C petroleum physicist
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Setting Up the Rig
Once the land is ready, several holes are dug to make way for the rig and main hole. A rectangular pit, called a cellar, is dug around the location of the actual drilling hole. The cellar provides a workspace around the hole. The crew then drills a main hole. The following diagram shows how a rig is set.
http://science.howstuffworks.com/oil-drilling2.htm
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Crude oil to Refineries Oil fields and offshore oil rigs
generally have hundreds of wells with flow lines that carry crude oil to the lease tanks. The crude oil flows from the wells to the unseen lease tanks via the flow lines, where it is accumulated, sampled and measured prior to further transportation via other connecting pipelines. Oil pipelines are considered to be a closed system since the chemicals theoretically don’t touch the environment, however leaks in the system do occur. Also, oil tankers bring oil to refineries and as was the case in the Exxon Valdez disaster, the environment suffers tremendously from oil production. Photo Courtesy
http://response.restoration.noaa.gov/photos/exxon/exxon.html
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Environmental Disasters
Statistic courtesy of http://www.itopf.com/stats.html
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iClicker Question
The process by which components in a chemical mixture are separated according to their different boiling points, is called A Distillationism B Fractionation C Fractioning D Fractional distillation E Fractional fractionating
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iClicker Question
Which of the following are not petroleum derived products? A gasoline B kerosene C jet fuel D plastics E None of the above
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World Oil Consumption
http://people.hofstra.edu/geotrans/eng/ch5en
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•Oil is trapped in rare geological structures•Most of the oil in the world comes from a few large wells•About one in ten exploratory drillings strike oil
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Overview of Natural Gas
Supply of recoverable natural gas available at affordable costs has greatly increased over past 10 years
Industry’s ability to produce natural gas from shales has gone from almost 0 to > 20% of U.S. needs in just 10 years
Natural gas demand is at 22-23 Tcf/year in the U.S. (historic highs). Increased availability of gas will allow demand to continue to grow over next several years
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U.S. Reserve Base – Trends Before and After Shale Gas Production
Significant increase in gas reserves and production from shales starts in 1999
Source: EIA
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U.S. Natural Gas Production
U.S. natural gas production is at its highest level ever in 2008
+1.1%/yr -1.9%/yr +3.7%/yr
Source: EIA
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Offshore Gulf of Mexico in Steep Decline
Production is down by almost 50% from 2001-07
Source: EIA
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Frac’d (Fracturing) Wells
Shale is very hard, and it was virtually impossible to produce gas in commercial quantities from this formation until recent improvements were made in hydraulic fracturing technology and horizontal drilling, and there was an upturn in the natural gas price.
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Conventional Well vs. Shale Gas Well Production Curves
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BarnettHaynesville
Marcellus
Woodford
Basins Where Additional Gas Will Be Produced From Shales
Estimated Gas In-Place in these Shales is ~ 2000 Tcf
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Today’s Relative Share of Energy Market by Fuel
Source: EIA – Annual Energy Outlook 2009
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U.S. Energy Demand by Fuel
120 -
100 -
80 -
60 -
40 -
20 -
0 - 1980
1995
2005
2015
2030
History Projections
Quadri
llion B
tu’s
Renewable
s
Liquids
Natural
GasNuclear
Coal
Biofuels
Source: EIA – Annual Energy Outlook 2009
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Natural Gas Use by Sector in 2008
21% Residential
29% Electricity Generation
14% Commercial
33% Industrial
3% Transportation
Source: EIA – Annual Energy Outlook 2009
Electricity generation from natural gas has grown at rate of 4%/year since 1990
Industrial usage of natural gas has fallen at rate of 2%/year since 1998
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Today’s Relative Share of Electricity Generation by Fuel
Natural Gas 21%
Nuclear20% Coal
49%
Oil 1%
Hydro 6%
Other Renewables 3%
Source: EIA – Electric Power Monthly, April 2009
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Natural Gas Supply thru 2030
Source: EIA – Annual Energy Outlook 2009
Alaska
25
-20
-15
-10
-5 -
0 -
199
5
200
5
201
5
202
5
History Projections
Unconventional
Conventional
Net Imports
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History: U.S. Natural Gas – Production & Consumption
Source: EIA
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Supply vs. Demand thru 2015
Available supply: Assume 1.8% growth / year in production capacity (starting in 2010) and net imports at 3 Tcf/yr vs. 3.3-4.0 Tcf/yr seen since ‘01
Demand (dashed curve): Assume 4% growth in use of gas for electricity generation after 1 year, 3% reduction in overall demand for 2009
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Natural Gas is Cleaner120
100
80
60
40
20
0
Natural Gas
Diesel Ethanol Blends
Low Sulfur Diesel
Bio Diesel
Gasoline
Relative Level of NOx Emissions
Relative Level of Particulate Emissions 120
100
80
60
40
20
0
Source: South Coast Air Quality Management District2007 Air Quality Management Plan Summit Panel
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Natural Gas is a Low Carbon Fuel
Natural Gas
Oil 28% more
Coal 43% more
0 50000 100000 200000150000
Pounds of Carbon per Billion BTU
Source: EIA, Natural Gas: Issues & Trends, 1998
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Economics of fuels
$/KWh
Source: SDI research + team analysis
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Distribution of natural gas
Impractical to ship: must route by pipe 1.3 million miles of pipe (250,000 miles of
mains)
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How much do we have left?
Estimated recoverable amount: 871 tcf 40 years at current rate Estimates like this do account for future discoveries
present proven reserves provide only 8 years’ worth
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Recollecting Chemistry
All fossil fuels are essentially hydrocarbons, except coal, which is mostly just carbon
Natural Gas is composed of the lighter hydrocarbons (methane through pentane)
Gasoline is hexane (C6) through C12
Lubricants are C16 and up
kJ per gram
55
51
50
46
48
48
48
48
48
48
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CoalCoal is a fuel that we have a lot of Primarily carbon, but some volatiles (CO,
CH4)
Reaction is essentially C + O2 CO2 + energy
Energy content varies depending on quality of coal, ranging from 4–7 Cal/g
Highly undesirable because of large amounts of ash, sulphur dioxide, arsenic, and other pollutants
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Coal types and composition
NaturalGraphite
Anthracite
Bituminous
Bituminous
sub-bituminous
Lignite
Peat
Wood
fixed carbon
ash
volatile matter
moisture content
kJ/g
34
29
35
31
27
25
21
20
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Use of Coal
88% of the coal used in the U.S. makes steam for electricity generation
7.7% is used for industry and transportation
3.5% used in steel production0.6% used for residential and commercial
purposes0.1% used on Halloween for trick-or-
treaters <chuckle>
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Estimated Worldwide Coal Reserves
Country Amount(109 tonne)
Percentageof Total
United States 250* 25
Russia 230† 23
Europe 138 14
China 115 12
Australia 82 8.3
Africa 55 5.6
South America 22 2.2
North America 7.7 0.8
Total 984 100
*1st edition of book had U.S. at 1500 billion tons. What happened to all that coal?†1st edition of book had Russian coal at 4300 billion tons. Gross overestimates?
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U.S. Coal Production History
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When will coal run out?
We use 109 tonnes of coal per year, so the U.S. supply alone could last as long as 250 (1500) years at current rate
Using variable rate model, more like 75–100 (400–600) years especially relevant if oil, gas are gone
This assumes global warming doesn’t end up banning the use of coal
Environmental concerns over extraction also relevant
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Shale Oil
Possibly 600–2000 billion barrels of oil in U.S. shale deposits compare to total U.S. oil supply of 230 billion bbl
Economically viable portion may only be 80 billion bbl
8 times less energy density than coal lots of waste rock: large-scale disposal problem
Maximum rate of extraction may be only 5% of our current rate of oil consumption limited by water availability
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Tar Sands
Sand impregnated with viscous tar-like sludge Huge deposit in Alberta, Canada
300 billion bbl possibly economically recoverable
It takes two tons of sands to create one barrel of oil energy density similar to that of shale oil
In 2003, 1 million bbl/day produced grand hopes for 5 Mbbl/day; or 6% of world oil
production
2002 production cost was $20 per barrel, so economically competitive