General Ecology and Population Issues
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Transcript of General Ecology and Population Issues
Environmental Problems
Population GrowthWasteful use of ResourcesDestruction and degradation of wildlife habitatsExtinction of plants and animalsPovertyPollution
Human activity has modified or disturbed ____% of the earth’s land.
73%27% remains intact and undisturbed. However the number is always decreasing.
EnvironmentSolar and earth capital Sun’s EnergyAirWaterAnimals and PlantsMineralsNatural purificationRecycling (natural and artificial)Pest control
Sustainable Society
Manages its economy and population size without exceeding all or part of the planet’s ability to absorb the environmental insults and replenishUse only what is needed and replenishes what is taken
Population Growth and the Wealth Gap
Types of societies and the differences this has on both population and the environment
Population ExplosionAlthough the global population rate is between 2-5%, the consequences of an increasing population of billions of people has become a key issue in many areas hand has lead to some countries having reproductive law to decrease population growth.
Population Estimates
1804192719601974198719992013202820542100
1 billion2 billion3 billion4 billion5 billion6 billion7 billion8 billion9 billion(range of estimates: 10.4-17 billion)
The population statistics—people living on the planet at the same time.
60,000 years ago = 1 billion130 years ago = 2 billion30 years ago = 3 billion15 years ago = 4 billion12 years ago = 5 billion6 years ago = 6 billion2 years ago = 7 billion
MDC = More Developed Countries
A country whose standard of living is similar to the USIndustrialized or post-industrialized societiesWhich countries can you think of that fall into this category?
LDC—Less Developed Countries
Countries that have a much lower standard of living than the US or at least most of the residents have this lower standard of living. Can you think of countries that fall into this category?
What caused these jumps in population?
10,000 – 12,000 years ago the Agricultural Revolution began275 years ago the Industrial RevolutionWhat effect does this lifestyle have on population?How does this tie into a sustainable society?
GNP Gross National Product
Market value in current dollars of all goods and services produced within and consumed within a country; imported and exported goods
Population Change
For the Planet: Births – Deaths = population changeFor a country: Births + immigrations – (deaths + emigrations) = population change
NPG and ZPG
ZPG = Zero Population GrowthWhat is the birth rate for zero population growth?NPG = Negative Population GrowthNegative population growth can be achieved by decreasing the birth rate to less than 2 per woman of childbearing age or increasing the death rate.
Total Fertility Rate (TFR)
Average number of children that a woman will have during her childbearing years
Factors Affecting TFRs
TraditionsEducationMarriageDivorceReligionHealthChildren as labor
UrbanizationCost of raising a childAverage marrying agePensionsAvailability of abortionContraception
Renewable or Perpetual
Continues without any artificial supportCan you think of any examples of this type of resource? Solar energyWind EnergyWater Energy Water purification (low yields)
Potentially Renewable
Resources that can be renewed but they must be replaced at the rate at which they are being usedCan you think of examples of this? TreesGrassAnimalsLakesSoil
Sustainable Yield
Rate at which a potentially renewable resource can be used indefinitely without reducing available supply
Nonrenewable ResourceA resource in fixed quantity that may take too long to replace to be effectiveCan you think of any examples of this type of resource?CoalOilNatural gasUranium
Iron Copper AluminumSaltClaySandphosphates
Biodiversity
Different life forms that can survive the variety of conditions currently found on earth
Pollution
Any addition to air, water, soil, or food that threatens the health, survival, or activities of a living organism
Two sources of pollution
Point Source—the source is identifiable Can you think of examples of this?
Nonpoint source—sources are general and not readily identified. Can you think of any of these?
Characteristics that make a type of pollution harmful
Chemical NatureConcentrationPersistence
Degradable (less than 10 years)Slowly Degradable (more than 10 years)Nondegradable (over 250 years)
Facts about Waste Longevity
How long will these last in a landfill?Banana Peel?2 yearsPlastic bag?10-20 yearsPlastic bottle?100 years
Aluminum Can?500 yearsGlass bottles?1,000 yearsStyrofoam?10,000 years at least