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ENVIRONMENTAL SCIENCE 13e
CHAPTER 6:The Human Population and Urbanization
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Global Population
• http://www.youtube.com/watch?v=sc4HxPxNrZ0
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Core Case Study: Are There Too Many of Us? (1)
• 6.8 billion people• 83 million more each year• 2050: 9.5 billion people at current
growth rates• Most growth in low-income and middle-
income countries• Enough resources for growing
population?
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A important question
• Can we provide an adequate standard of living for a projected 2.7 billion more people by 2050 without causing widespread environmental damage?
• Overpopulation vs overconsumption
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Core Case Study: Are There Too Many of Us? (2)
• Negative viewpoint– 20% currently lack basic necessities– Declining conditions increase death rate– Increased resource use – Increased environmental degradation
• Positive viewpoint– Technological solutions will increase carrying
capacity– Growing population a valuable resource
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Fig. 6-1, p. 94
Crowded street in China: largest population of all countries with 1.3 Billion peopleTogether China and India are home to 1 of every 3 people on Earth
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6-1 How Many People Can the Earth Support?
• Concept 6-1 We do not know how long we can continue increasing the earth’s carrying capacity for humans without seriously degrading the life-support system that keeps us and many other species alive.
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Human Population Explosion
• Exponential growth (J-curve) in past 200 years
• Three major reasons – Ability to expand into diverse habitats– Emergence of agriculture– Sanitation systems and control of infectious
diseases decreased death rates
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How Long Can the Human Population Grow?
• Rate slowing, but still exponential
• Uneven global growth
• No population can grow indefinitely
• 2050: 9.5 billion people at current growth rates
• Most growth in developing countries, least likely to cope
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Fig. 1-1, p. 1
Hunting and gathering
Agricultural revolution
Industrial revolution
Black Death—the Plague
Industrial revolution
Fig. 1-10, p. 16
?
2-5 millionyears
13
12
11
10
9
8
7
6
5
4
3
2
1
0
8000 6000 4000 2000 2000 2100B.C. A.D.
Exponential Growth: the J-shaped curve of past world population growth
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Fig. 6-2, p. 96
Low7.8
12
11
10
9
8
7
6
5
4
3
2
Po
pu
lati
on
(b
illi
on
s)
Year
1950 1960 1970 1980 1990 2000 2010 2020 2030 2040 2050
High10.8
Medium9.5
UN world population projections
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Fig. 6-3, p. 97
Elimination of many natural predators
Altering Nature to Meet Our Needs
Natural Capital Degradation
Reduction of biodiversity
Increasing use of the earth's net primary productivity
Increasing genetic resistance of pest species and disease-causing bacteria
Relying mostly on polluting and climate-changing fossil fuels
Interfering with the earth's chemical cycling and energy flow processes
Using some renewable resources faster than they can be replenished
Introduction of potentially harmful species into communities
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6-2 What Factors Influence the Size of the Human Population?
• Concept 6-2A Population size increases through births and immigration and decreases through deaths and emigration.
• Concept 6-2B The average number of children born to women in a population (total fertility rate) is the key factor that determines the population size.
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Population Change
Population change =
(births + immigration) - (deaths + emigration)
Demographers look at birth rates and death rates
• 2009:China, 1.3 billion people
India, 1.1 billion people
USA, 306 million people
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Number of Children
• Fertility rates affect population size and growth rate
• Total fertility rate (TFR)
• 1950-2009: Global TFR fell to:1.6 from 2.5 in developed countries
2.8 from 6.5 in developing countries
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Case Study: The U.S. Population Is Growing Rapidly
• Quadrupled in 100 years, despite oscillations in TFR
• Baby boom: High TFR• Current births outnumbering deaths
and legal immigration• Growing faster than other developed
countries• 2050 estimate: 439 million
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Baby boom(1946–64)
Replacementlevel
Fig. 6-4, p. 98
Year
Bir
ths
per
wo
man
1920 1930 1940 1950 1960 1970 1980 1990 2000 2010
4.0
3.5
3.0
2.52.12.0
1.5
1.0
0.5
0
TFR for US
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Factors Affecting Birth Rates (1)
• Importance of children as part of labor force
• Cost of raising and educating children
• Availability of retirement systems
• Urbanization• Educational and employment opportunities for
women
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Factors Affecting Birth Rates (2)
• Average marriage age
• Availability of legal abortion and reliable birth control methods
• Religious beliefs, traditions, cultural norms
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Factors Affecting Death Rates
• Population growth is also response to decline in crude death rate
• Life expectancy and infant mortality rate important indicators of overall health
• Average life expectancy increased• Infant mortality – barometer of a
society’s quality of life
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Supplement 3, Fig. 8, p. S10
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*6-3 How Does a Population’s Age Structure Affect Its Growth or Decline?
• Concept 6-3 The numbers of males and females in young, middle, and older age groups determine how fast populations grow or decline.
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*Age Structure
• Distribution of population– Prereproductive – Reproductive– Postreproductive
• Country with many young people grows rapidly
• Country with many older people will decline• Developing countries: >30% under 15 years old
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Fig. 6-6, p. 102
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Fig. 6-6, p. 102
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Age Structure Predicts the Future
• 36% of U.S. population baby boomers
• Graying of America
• Over time: increasing percentage of older baby boomers
• Changes the economy
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Stepped Art
2035201519851955
Fig. 6-8, p. 103
Tracking the baby-boom generation in the United States. US population by age and sex for years indicated.
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Declines Occur in Aging Populations
• “Baby bust” or “birth dearth” – TFR below 1.5 children per couple
• Labor shortages
• Strain on governments for public services
• Fewer taxpayers
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*6-4 How Can We Slow Human Population Growth?
• Concept 6-4
We can slow population growth by
-reducing poverty
-encouraging family planning
-and elevating the status of women.
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*Stages of Demographic Transition
• Preindustrial
• Transitional – demographic trap
• Industrial
• Postindustrial • Some analysts believe that most of the world’s developing countries
will make a demographic transition over the next few decades, mostly because modern technology can raise per capita incomes by bringing economic development and family planning to such countries. Other analysts fear rapid pop growth, extreme poverty, and increasing environmental degradation in some low-income countries could leave them stuck in stage 2.
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Death rate
Total population
Birth rate
Population grows rapidly because birth rates are high and death rates drop because of improved food production and health
Decreasing
Stage 2Transitional
Increasing Very high
Stepped Art
Population growth levels off and then declines as birth rates equal and then fall below death rates
Stage 4Postindustrial
NegativeZero
Populationgrows veryslowly becauseof a highbirth rate(to compensatefor high infantmortality) and ahigh death rate
Stage 1Preindustrial
Growth rate over time
80
70
60
50
40
30
20
10
0
Bir
th r
ate
an
d d
eath
rat
e(n
um
ber
per
1,0
00 p
er
yea
r)
Low
Population growth slows as both birthand death rates drop because of improved food production, health, and education
Stage 3Industrial
Low
Fig. 6-10, p. 105
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Think about it
• Stage 1: birth rate, death rate, population
• Stage 2: birth rate, death rate, population
• Stage 3: birth rate, death rate, population
• Stage 4: birth rate, death rate, population
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Family Planning (1)
• Birth spacing, birth control, health care• Increased availability of contraception• 55% drop in TFR of developing
countries• Developing countries
– Almost half pregnancies unplanned– Often lack access to family planning
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Family Planning (2)
• Invest in family planning
• Reduce poverty
• Elevate the social and economic status of women
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Empowering Women Can Slow Population Growth (1)
• Women tend to have fewer children if they:– are educated
– control their own fertility
– have a paying job outside the home
– do not have their rights suppressed
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*Empowering Women Can Slow Population Growth (2)
• Women do almost all domestic housework and childcare
• Women do 60-80% of agriculture, wood gathering, water hauling
• Globally, women do 2/3 of all work for 10% of income
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Empowering Women Can Slow Population Growth (3)
• Illiterate woman 64% of world’s population, 70% of the poor
• When daughters considered less valuable, not sent to school
• Poor conditions for women leads to environmental degradation
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Case Study: Slowing Population Growth in China (1)
• One-child families• Halved birth rate and drastically
reduce TFR• Improved quality of life• Strict family planning• Sons still preferred – gender
imbalance
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Case Study: Slowing Population Growth in China (2)
• Population rapidly aging
• Rapidly growing economy
• Larger middle class increases resource consumption and waste
• Sustainable economic plan needed to avoid environmental degradation
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Case Study: Slowing Population Growth in India
• Tried to slow population growth for five decades
• Most populous country in 2015• Problems increase with growing population
– Poverty– Malnutrition– Environmental degradation– Growing middle class – resource consumption
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Assignment
• Read Handout: “What do you think? Cultural Choices and the Rate of Population Growth” that discusses the approach to population control taken by two Indian states, Kerala and Andra Pradesh
• Answer the question Which method of population control (that used by Kerala or Andra Pradesh) offers better insights and models for other countries? What are the benefits and limitations of each approach?
• What do you think of the approach taken in Thailand? Why might this approach not work everywhere?
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6-5 What Are the Major Urban Resource Environmental Problems?
• Concept 6-5 Most cities are unsustainable because of high levels of resource use, waste, pollution, and poverty.
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Urban Living
• Half the world lives in urban areas
• 79% of Americans live in cities
• 50% of world population lives in cities
• Urban areas continue to grow– Natural increase
– Immigration
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Major Trends in Urban Growth
• Proportion of urban global population growing
• Number and sizes of urban areas mushrooming
• Rapid increase in urban populations in developing countries
• Urban growth slower in developed nations
• Poverty increasing
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Fig. 6-11, p. 108
2004 (estimated)2015 (projected)
Los Angeles13.3 million19.0 million
New York16.8 million17.9 million
Sao Paulo18.3 million21.2 million
Buenos Aires12.1 million13.2 million
Cairo10.5 million11.5 million
Karachi10.4 million16.2 million
Dhaka13.2 million22.8 million
Beijing10.8 million11.7 million
Tokyo26.5 million27.2 million
Shanghai12.8 million13.6 million
Jakarta11.4 million17.3 million
Manila10.1 million11.5 million
Calcutta13.3 million16.7 million
Mumbai(Bombay)16.5 million22.6 million
Delhi13.0 million20.9 million
Mexico City18.3 million20.4 million
Osaka11.0 million11.0 million
Lagos12.2 million24.4 million
Key
Shows populations of 18 megacities (each with 10 million ormore people) in 2009 and their projected populations in 2015. All but 3 are located in developing countries.
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Case Study: Urbanization in the United States (1)
• 1800–2009: urban population increased from 5% to 79%
• Migration patterns– Rural areas to large cities
– Large cities to suburbs and smaller cities
– Cities and suburbs to rural areas
– North and East to South and West
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Fig. 6-12, p. 109
Almost 8 of every 10 Americans live in urban areas. Areas with names in whiteAre fastest growing metropolitan areas.48% of all Americans live in cities of 1million or more
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Urban Sprawl is a product of
• Prosperity• Ample and affordable land• Automobiles• Cheap gasoline• Poor urban planning
• Urban sprawl=growth of low density development on the edges of cities and towns
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Urban Sprawl Problems
• Increased automobile use
• Decreased energy efficiency
• Destruction of cropland, forests, wetlands
• Economic deaths of some cities
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Fig. 6-14, p. 110
Economic Effects
Urban Sprawl
Natural Capital Degradation
Loss of cropland
Loss of forests andgrasslands
Loss of wetlands
Loss andfragmentation ofwildlife habitats
Land andBiodiversity
Increased use of surfacewater and groundwater
Increased runoff andflooding
Increased surface waterand groundwaterpollution
Decreased naturalsewage treatment
Water
Increased energy useand waste
Increased air pollution
Increased greenhousegas emissions
Can enhance climatechange
Energy, Air,and Climate
Decline ofdowntown businessdistricts
Increasedunemployment incentral city
Loss of tax base incentral city
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Advantages of Urbanization (1)
• Economic development
• Innovation
• Education and jobs
• Technological advances
• Longer life spans
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Advantages of Urbanization (2)
• Better social and medical services
• Recycling more feasible
• Biodiversity increased
• Increased energy efficiency
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Disadvantages of Urbanization (1)
• Unsustainable systems
• Lack of vegetation
• Water problems
• Pollution and health problems
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Disadvantages of Urbanization (2)
• Noise pollution
• Climate and artificial light
• Urban heat islands
• Light pollution
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Information
Inputs
Energy
Food
Water
Rawmaterials
Manufacturedgoods
Money
Outputs
Solid wastes
Waste heat
Air pollutantsWater pollutantsGreenhouse gasesManufactured goods
Noise
Wealth
Ideas
Fig. 6-15, p. 111
Natural capital degradation: urban areas rarely are sustainable systems. Typical cityDepends on large non-urban areas for huge inputs of matter and energy resources and for large outputs of waste matter and heat.
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Urban Poor in Developing Countries
• Slums
• Shantytowns and squatter settlements
• Lack of basic services
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Slums Mexico City
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Case Study: Mexico City (1)
• Large population
• Severe noise, water, and air pollution
• 50% unemployment
• 100,000 premature deaths per year
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Case Study: Mexico City (2)
• 3 million without sewer
• Fecal snow
• Geography contributes to air pollution
• Progress – tree planting and lower air pollution
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6-6 How Does Transportation Affect Urban Environmental Impacts?
• Concept 6-6 In some countries, most people live in dispersed urban areas and depend mostly on motor vehicles for their transportation.
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Cities Can Grow Outward or Upward
• Compact cities– Transportation by walking, biking, or
mass transit
– Hong Kong, Tokyo
• Dispersed cities– Transportation by automobile
– Most American cities
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Automobiles
• Gas guzzlers
• 40,000 people per year die from auto accidents in the United States
• World’s largest source of air pollution
• Lead to urban sprawl and congestion
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Reduce Automobile Use
• User-pays system
• Full-cost pricing
• Tax revenues to finance mass transit, bike paths, sidewalks
• High gasoline tax unlikely
• Need to discourage automobile use
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Alternatives to Cars
• Bicycles
• Mass transit systems in urban areas
• Bus systems
• Rapid rail
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Fig. 6-18, p. 115
Trade-Offs
Are quiet andnon-polluting
Take fewresources tomake
Burn no fossilfuels
Require littleparking space
Secure bike parkingnot yet widespread
Are impractical forlong trips
Provide no protectionfrom bad weather
Provide littleprotection in anaccident
Bicycles
Advantages Disadvantages
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Fig. 6-19, p. 116
Advantages
Is expensive to buildand maintain
Is cost-effective onlyin densely populatedareas
Commits riders totransportationschedules
Can cause noise andvibration for nearbyresidents
Reduces carcongestion incities
Causes fewerinjuries anddeaths thancars do
Reduced need formore roads andparking areas
Uses less energyand produces lessair pollution thancars do
Trade-Offs
Mass Transit Rail
Disadvantages
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Fig. 6-20, p. 116
Trade-Offs
Can lose money becausethey require affordable fares
Can get caught in trafficand add to noise andpollution
Commit riders totransportation schedules
Can greatly reduce caruse and air pollution
Can be rerouted asneeded
Cost less to developand maintain thanheavy-rail system
Advantages Disadvantages
Buses
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Fig. 6-21, p. 116
Trade-Offs
Is costly to run andmaintain
Causes noise andvibration for nearbyresidents
Has some risk ofcollision at carcrossings
Is much more energyefficient per rider than carsand planes are
Produces less pollutionthan do cars and planes
Can reduce need for moreair travel, cars, roads, andparking areas
Advantages Disadvantages
Rapid Rail
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*6-7 How Can Cities Become More Sustainable and Livable?
• Concept 6-7 An ecocity allows people to choose walking, biking, or mass transit for most transportation needs; recycle or reuse most of their wastes; grow much of their food; and protect biodiversity by preserving surrounding land.
• What is an Ecocity? What is an example of an ecocity?
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Environmentally Sustainable Cities
• Smart growth• Ecocities
– Use renewable energy as much as possible– Build and design people-oriented cities– Use energy and matter efficiently– Prevent pollution and reduce waste– Recycle, reuse, and compost – Protect and encourage biodiversity– Promote urban gardens and farmers markets– Zone for environmentally stable population levels
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Homework Assignment
• Go on an ecocity scavenger hunt! Find at least 3 things in Athens or on campus that could be found in an ecocity.
• Take pictures and email them with a description of why you think you would find it in an ecocity
• You may work in pairs or groups of 3 if you wish
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Fig. 6-22, p. 117
Smart Growth ToolsLimits and Regulations
Limit building permitsUrban growthboundariesGreenbelts around cities
Public review of newdevelopment
Zoning
Encourage mixed use ofhousing and smallbusinesses
Concentratedevelopment along masstransportation routes
Promote high-densitycluster housingdevelopments
Planning
Ecological land-useplanning
Environmental impactanalysisIntegrated regionalplanningState and nationalplanning
Protection
Preserve existing open space
Buy new open space
Buy development rights thatprohibit certain types ofdevelopment on land parcels
Taxes
Tax land, not buildings
Tax land on value of actual use(such as forest and agriculture)instead of on highest value asdeveloped land
Tax Breaks
For owners agreeing not to allow certain types of development (conservation easements)For cleaning up and developing abandoned urban sites (brownfields)
Revitalization and New GrowthRevitalize existing towns and citiesBuild well-planned new towns and villages within cities
Solutions
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*Case Study: Curitiba, Ecocity in Brazil (1)
• Curitiba – “ecological capital” of Brazil
• Inexpensive, efficient mass transit
• High-rise apartments near bus routes, mixed-use structures
• Bike and pedestrian paths
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Case Study: Curitiba, Ecocity in Brazil (2)
• 1.5 million trees planted
• Recycling
• Many services for the poor
• Emphasis on ecological awareness, health, literacy
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Curitiba Video
• http://www.youtube.com/watch?v=hRD3l3rlMpo&feature=fvw
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Fig. 6-23, p. 118
Bus rapid transit system in Curitiba, Brazil. Boarding is speeded up by the use of Extra-wide doors and boarding platforms sheltered by large glass tubes where passengers can pay before getting on the bus.
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Fig. 6-23, p. 118
Interdistrict
Citycenter
RouteWorkersFeederDirectExpress
Each of the 5 major spokes has 2 express lanes used only by buses.
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Three Big Ideas from This Chapter - #1
The human population is increasing rapidly and may soon bump up against environmental limits.
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Three Big Ideas from This Chapter - #2
We can slow human population growth by reducing poverty, encouraging family planning, and elevating the status of women.
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Three Big Ideas from This Chapter - #3
Most urban areas, home to half of the world’s people, are unsustainable, but they can be made more sustainable and livable within your lifetime.
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Review Growth CurvesReview Growth Curves Exponential Growth
Logistic Growth
Carrying capacity= capacity of a given habitat to support a given species, stated in terms of the maximum population of the species that the habitat can support over a given period
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*What will happen to the population size in the future in each of the age structure diagrams?
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Fig. 6-6, p. 102
*What will happen here?