Presentation on theme: "Objectives Summarize the current state and effects of human population growth Explain the importance of effective resource management."— Presentation transcript:
1 KEY CONCEPT As the human population grows, the demand for Earth’s resources increases.
2 ObjectivesSummarize the current state and effects of human population growthExplain the importance of effective resource management
3 Earth’s human population continues to grow. Earth’s human carrying capacity is unknown.
4 Technology has helped to increase Earth’s carrying capacity. gas-powered farm equipmentmedical advancements
5 The growing human population exerts pressure on Earth’s natural resources. Nonrenewable resources are used faster than they form.coaloil
6 Renewable resources cannot be used up or can replenish themselves over time. windwatersunlightGrowing use of nonrenewable resources may lead to a crisis.Resources must be properly managed.
7 An ecological footprint is the amount of land needed to support a person. The land must produce and maintain enoughfood and watershelterenergywaste
8 Several factors affect the size of the ecological footprint. amount and efficiency of resource useamount and toxicity of waste produced
9 Give 3 examples of how technology has influenced human population growth Advances in medicine have reduced infant mortality and prolonged life spansIndustrial technologies have made transportation and agriculture more productive and easier, allowing for easier food production and distributionPlumbing and sewage treatment have improved sanitation, reducing incidence of water born illness
10 What is the difference between renewable and nonrenewable resources Are difficult to replenish in a time span meaningful to humansCan be replenished by Earths natural processes
11 What factors can limit the growth of the human population? DiseaseDroughtOverexploitation of limited resourcesCrop pestsWar
12 Air QualityKEY CONCEPT Fossil fuel emissions affect the biosphere.
13 Air QualityObjectiveDescribe the sources, types, and effects of pollutionExplain how air pollution contributes to acid rain
14 Pollutants accumulate in the air. Air QualityPollutants accumulate in the air.Pollution is any undesirable factor added to the air, water, or soil.Smog is one type of air pollution.sunlight interacts with pollutants in the airpollutants produced by fossil fuel emissionsmade of particulates and ground-level ozone
15 Air QualitySmog can be harmful to human health.Acid rain is caused by fossil fuel emissions.produced when pollutants in the water cycle cause rain pH to dropcan lower the pH of a lake or streamcan harm trees
16 Air pollution is changing Earth’s biosphere. Air QualityAir pollution is changing Earth’s biosphere.The levels of atmospheric carbon dioxide rise and fall over time.High levels of carbon dioxide are typical of Earth’s warmer periods.
17 sunlight penetrates Earth’s atmosphere Air QualityThe greenhouse effect slows the release of energy from Earth’s atmosphere.sunlight penetrates Earth’s atmosphereenergy is absorbed and reradiated as heatgreenhouse gases absorb longer wavelengthsGreenhouse gas molecules rerelease infrared radiationmethane (CH4)water (H2O)carbon dioxide (CO2)
18 Global warming refers to the trend of increasing global temperatures. Air QualityGlobal warming refers to the trend of increasing global temperatures.North Pole
19 Name and describe 2 ways in which pollution affects ecosystems Air QualityName and describe 2 ways in which pollution affects ecosystemsPollution can result in smog and acid rainSmog is caused by the interaction of sunlight with pollutants produced by fossil fuel emissionsAcid rain results from the mixture of these emissions with water
20 How does the greenhouse effect keep Earth warm? Air QualityHow does the greenhouse effect keep Earth warm?Infrared energy Radiating from Earths surface is absorbed by greenhouse molecules such as water, carbon dioxide, and methane.This energy, also called heat, is then released and absorbed by other molecules of Earths surface or the atmosphere.
21 Air QualityExplain how a build-up of CO2 in the atmosphere could increase Earths global temperature.With more greenhouse molecules in the atmosphere, less heat would be allowed to escape, causing Earth to become warmer.
22 Air QualityGreenhouse gasses are found close to earths surface and high above in the atmosphere. Name 2 important functions of greenhouse gasses at Earths surface.At Earths surface water vapor condenses to form precipitation which is part of the hydrologic cycleCarbon dioxide is a necessary reactant for photosynthesis
23 Air QualityOcean producers such as phytoplankton are an important part of food webs, but they require a specific temperature range to survive. How might increased water temperature affect these ocean food webs?If increased water temperatures kill the phytoplankton, the lowest trophic levels will be gone and the food webs will probably collapse
24 Water QualityKEY CONCEPT Pollution of Earth’s freshwater supply threatens habitat and health.
25 Water QualityObjectivesDescribe how water pollution affects ecosystemsExplain how biomagnification causes accumulation of toxins in food chains
26 Biomagnification causes accumulation of toxins in the food chain. Water QualityBiomagnification causes accumulation of toxins in the food chain.Pollutants can move up the food chain.predators eat contaminated preypollution accumulates at each stage of the food chainTop consumers, including humans, are most affected.
27 How do PCBs affect bird populations through biomagnification? Water QualityHow do PCBs affect bird populations through biomagnification?PCBs travel up through trophic structure of an ecosystem and accumulate in large amounts in the eggs of large birds.PCBs can negatively impact growth and development within the egg, causingGenetic mutationsDeformitiesDeathThe population of birds may crash as a result
28 Water QualityWould a buffalo or a mountain lion be more affected by biomagnification? Why?A mountain lion would be more affected because it is higher on the food chain and would ingest more contaminants from its food supply
29 How does the biomagnification pyramid compare with the energy pyramid? Water QualityHow does the biomagnification pyramid compare with the energy pyramid?They are oppositeEnergy decreases as you move up the food chain, but pollution increases
30 16.4 Threats to biodiversity KEY CONCEPT The impact of a growing human population threatens biodiversity.
31 16.4 Threats to biodiversity ObjectivesAssess the consequences of loss of biodiversityExplain how loss of habitat and introduced species affect ecosystems and biodiversity
32 Preserving biodiversity is important to the future of the biosphere. Threats to biodiversityPreserving biodiversity is important to the future of the biosphere.The loss of biodiversity has long-term effects.loss of medical and technological advancesextinction of speciesloss of ecosystem stability
33 Loss of habitat eliminates species. Threats to biodiversityLoss of habitat eliminates species.Habitat fragmentation prevents an organism from accessing its entire home range.occurs when a barrier forms within the habitatoften caused by human development
34 Habitat corridors are a solution to the problem. corridors can be road overpasses or underpassesallow species to move between different areas of habitat
35 Introduced species can disrupt stable relationships in an ecosystem. Threats to biodiversityIntroduced species can disrupt stable relationships in an ecosystem.An introduced species is one that is brought to an ecosystem by humans.accidentalpurposefulInvasive species can have an environmental and economic impact.
36 Invasive species often push out native species. Threats to biodiversityInvasive species often push out native species.kudzu (southeastern United States)Burmese python (Florida Everglades) & mice (Australia)
37 List reasons that biodiversity is important to humans Threats to biodiversityList reasons that biodiversity is important to humansA loss of diversity could mean a loss of food, medicine, and economic activity
38 How does habitat fragmentation affect migrating bird populations? Threats to biodiversityHow does habitat fragmentation affect migrating bird populations?Birds need large areas of land or water on which to rest and feed during long migrations.If these habitats aren’t available they may not be able to complete a migration
39 What types of damage can introduced species cause? Threats to biodiversityWhat types of damage can introduced species cause?Introduced species can disrupt ecosystems, threaten human health, and physically dominate or overtake waterways and human-made structures
40 How could continued fragmentation reduce biodiversity? Threats to biodiversityHow could continued fragmentation reduce biodiversity?If species are cut off from habitats they need for survival or reproduction, they could become extinct, thereby reducing biodiversity
41 Due Wednesday: In your Study guide Workbook Chapters 13 & 14Chapters 15 & 16PagesNumbers1331-513410135All1-61471487-101506-131511-41526-91 & 4PagesNumbersAll1571-41581615-6162all