Environmental Problems, Their Causes, and Sustainability 1

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FishShellfishDemersal(mostly bottom dwelling)Pelagic(surface dwelling)CrustaceansMollusksHakeSardine Anchovy KrillOysterClamHerringShrimpHaddockMackerelLobsterOctopusCodTunaCrabSquidFigure 14-23 Some major types of commercially harvested marine fish and shellfish.endangered and threatened sea turtles. Only the largefish are kept. Most of the fish and other aquaticspecies—called bycatch—are thrown back into theocean dead or dying.Another method, purse-seine fishing, involvescatching surface-dwelling species such as tuna, mackerel,anchovies, and herring, which tend to feed inschools near the surface or in shallow areas. After locatinga school the fishing vessel surrounds it with alarge net called a purse seine. Then they close the netlike a drawstring purse to trap the fish. Nets used tocapture yellowfin tuna in the eastern tropical PacificOcean have killed large numbers of dolphins thatswim on the surface above schools of tuna.Fishing vessels also use longlining. It involvesputting out lines up to 130 kilometers (80 miles) long,hung with thousands of baited hooks. The depth of thelines can be adjusted to catch open-ocean fish speciessuch as swordfish, tuna, and sharks or bottom fishessuch as halibut and cod. Longlines also hook endangeredsea turtles, sea-feeding albatross birds, and pilotwhales and dolphins.With drift-net fishing, fish are caught by huge driftingnets that can hang as much as 15 meters (50 feet)below the surface and be up to 64 kilometers (40 miles)long. This method can lead to overfishing of the desiredspecies and may trap and kill large quantities ofunwanted fish and marine mammals (such as dolphins,porpoises, and seals), marine turtles, andseabirds. Since 1992, a UN ban on the use of drift netslonger than 2.5 kilometers (1.6 miles) in internationalwaters has sharply reduced use of this technique. Butlonger nets continue to be used because compliance isvoluntary and it is difficult to monitor fishing fleetsover vast ocean areas. Also, the decrease in drift netshas led to increased use of longlines, which often havesimilar effects on marine wildlife.Figure 14-25 shows the effects of these now commonefforts to increase the seafood harvest. After increasingfourfold between 1960 and 1982, the annualcommercial fish catch (marine plus freshwater harvestbut excluding aquaculture) has declined and leveledoff (Figure 14-25, left). After doubling between 1950and 1956, the per capita catch leveled off until 1980and since then has been declining (Figure 14-25, right)and may continue to decline because of overfishing,pollution, habitat loss, and population growth.Connections: How Are Overfishing andHabitat Degradation Affecting FishHarvests? Dropping YieldsAbout three-fourths of the world’s commerciallyvaluable marine fish species are overfished or fishedat their biological limit.Fish are renewable resources as long as the annual harvestleaves enough breeding stock to renew the speciesfor the next year. Overfishing is the taking of so manyfish that too little breeding stock is left to maintainnumbers.Prolonged overfishing leads to commercial extinction,when the population of a species declines to thepoint at which it is no longer profitable to hunt forthem. Fishing fleets then move to a new species or a298 CHAPTER 14 Food and Soil Resources
Spotter airplaneFish farmingin cageTrawlerfishingPurse-seine fishingtrawl flaptrawl linessonartrawl bagfish schoolLong line fishingDrift-net fishingfloatfish caughtby gillsbuoylines withhooksFigure 14-24 Major commercial fishing methods used to harvest various marine species. These methods havebecome so effective that many fish have become commercially extinct.10025Catch(millions of metric tons)80604020Per capita catch(kilograms per person)201510501950 19601970 1980 1990 2000YearTotal World Fish Catch01950 19601970 1980 1990 2000YearWorld Fish Catch per PersonFigure 14-25 Natural capital degradation: world fish catch (left) and world fish catch per person (right),1950–2000. The total catch and per capita catches since 1990 may be about 10% lower than shown here becauseof the discovery in 2000 that since 1990 China had apparently been inflating its fish catches. (Data fromUN Food and Agriculture Organization and Worldwatch Institute)http://biology.brookscole.com/miller14299
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1Environmental Problems, TheirCause
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AirSOLAR ENERGYRESOURCESWaterEnergy
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changes that lead to an increasingl
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take the resources of 1.15 planet e
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Causes of Environmental Problems•
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Developing Countriesxx=Population (
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■ We should encourage earth-susta
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2. Write two-page scenarios describ
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A continent ages quickly once we co
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Good NewsMore foodSupported alarger
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Figure 2-8 Theodore (“Teddy”)Ro
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What Happened during the 1970s? The
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on which they and their ancestors h
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Science is an adventure of the huma
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CTIONSWhat Is Harmingthe Robins?Sup
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After building and testing a mathem
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I am going to give you a brief intr
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Figure 3-6 The pH scale, used to me
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The different molecules of DNA that
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Energy emitted from sun (kcal/cm 2
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aluminum foil. When solid water (ic
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nn23592 UUranium-235nucleus9236Kr14
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SolarenergyChemicalenergy(photosynt
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number of resource users. In other
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The earth’s thin film of living m
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(a) Eukaryotic CellNucleus(informat
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AtmosphereVegetationBiosphereand an
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Coastal chaparraland scrubConiferou
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NoorganismsLower limitof toleranceF
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Detritus feedersDecomposersLong-hor
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First TrophicLevelSecond TrophicLev
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Figure 4-20 Generalized pyramid of
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Terrestrial EcosystemsSwamps and ma
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every handful of topsoil break down
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suited for plant growth. It has a t
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Figure 4-29 Naturalcapital: simplif
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wildlife habitats, alter temperatur
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miningFertilizerexcretionuptake bya
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How Are Human Activities Affecting
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For example, people visit degraded
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There is grandeur to this view of l
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According to the theory of evolutio
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Black skimmerseizes small fishat wa
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5-4 SPECIATION, EXTINCTION,AND BIOD
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Scientists have also identified per
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Identify and extractgene with desir
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infrared radiation, as a rattlesnak
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To do science is to search for repe
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figure. Scientists hypothesize that
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ArcticCircleTropic ofCancerNorth Pa
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Winds can also affect regionalclima
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FPO(a) Rays of sunlight penetrateth
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ColdPolarTundraSubpolarDecreasing t
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Figure 6-20 Natural capital:some co
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Beisa oryxCape buffaloWildebeestTop
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Figure 6-25 Natural capitaldegradat
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Natural Capital DegradationGrasslan
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4540HarpyeagleEmergentlayer35Tocoto
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with sunlight available only 6-8 ho
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Natural Capital DegradationWhen we
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If there is magic on this planet, i
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there. Photosynthesis cannot take p
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Figure 7-7 View of an estuary taken
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Rocky Shore BeachSea starHermit cra
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Figure 7-12 Natural capital:some co
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EcologicalServicesClimatemoderation
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In warm months the bottom layer of
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According to scientists, we urgentl
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Animal and vegetable life is too co
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HighHighHighRate of immigrationor e
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mostly on land and eat insects that
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According to this hypothesis, musse
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Many people—influenced by movies
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strychnine, peyote, nicotine, and r
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It is tempting to think of mutualis
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How Do Species Replace One Another
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By contrast, grasslands are much le
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9Population EcologyPopulationContro
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The size of a population that inclu
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Number of reindeer2,0001,5001,00050
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Reproductive individuals in populat
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Percentage surviving (log scale)100
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A third type of alteration is using
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In the next chapter we will apply t
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The problems to be faced are vast a
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ates affect a country’s populatio
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United States Mexico CanadaPopulati
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and a high incidence of infectious
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Age100+95-9990-9485-8980-8475-7970-
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Age Distribution (%)403530252015105
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80Stage 1PreindustrialStage 2Transi
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also make up 70% of the world’s p
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Such experience also suggests that
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Forests precede civilizations, dese
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The Species ApproachGoalProtect spe
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parkways, trails, rivers, seashores
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Weak treesremovedFigure 11-8 Short
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AdvantagesHigher timberyieldsMaximu
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trees no faster than they are reple
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Sudden oak death White pine blister
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vere forest fires for two reasons.
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and degradation practices, Brazil
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SolutionsSustaining Tropical Forest
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• Integrate plans for managing pa
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Should Reserves Be as Large as Poss
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Figure 11-24 Endangered natural cap
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ity of ecosystems well enough to re
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original state? How much of it shou
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The last word in ignorance is the p
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Florida manatee Northern spotted ow
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each of these three species estimat
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BiophiliaBiologist EdwardO. Wilson
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Island species, many of them endemi
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Deliberately Introduced SpeciesPurp
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The Termite from HellForget killer
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© Karl Ammann. Biosynergy Institut
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tional Trade in Endangered Species
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Most people would say yes. The prob
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the act allows for economic concern
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Page 247 and 248: 13 SustainingAquatic BiodiversityBi
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Page 259 and 260: What Role Can ReconciliationEcology
Page 261 and 262: eries. When it works, community-bas
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Page 265 and 266: water withdrawal for irrigation. An
Page 267 and 268: SolutionsRebuilding Salmon Populati
Page 269 and 270: 14 Foodand Soil ResourcesSoilBiodiv
Page 271 and 272: Industrialized agricultureShifting
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Page 277 and 278: According to the U.S. Department of
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Page 293: A more expensive and less widely us
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Page 301 and 302: 15 WaterResourcesWaterCASE STUDYWat
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Page 305 and 306: Groundwater normally moves from poi
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Page 315 and 316: Aquifers provide drinking water for
Page 317 and 318: WYOMINGCOLORADONEW MEXICOSOUTH DAKO
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Page 323 and 324: 15-8 TOO MUCH WATERWhat Causes Floo
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Page 327 and 328: 16 MineralGeology and NonrenewableR
Page 329 and 330: AbyssalhillsAbyssalfloorOceanicridg
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Page 337 and 338: How Are Buried Mineral DepositsRemo
Page 339 and 340: 16-6 ENVIRONMENTAL EFFECTSOF USING
Page 341 and 342: Separationof ore fromgangueMetal or
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Can We Find Substitutes for ScarceN
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Typical citizens of advanced indust
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Figure 17-5 shows energy consumptio
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Currently, oil has a high net energ
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ArcticOceanCoalPrince WilliamSoundG
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Oil (million barrels per day)120100
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Coal-firedelectricitySynthetic oil
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Burning natural gas emits CO 2 but
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Trade-OffsCoalxHOW WOULD YOU VOTE?
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Small amounts ofradioactive gasesUr
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After more than 50 years of develop
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CoalAmple supplyHigh net energyyiel
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corrode and release their radioacti
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out the entire rail or truck trip i
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manently in 1998. Because of this e
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18 andEnergy EfficiencyRenewable En
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Energy Inputs System Outputs86%8%3%
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source. These systems have an energ
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ABCombustion engine:Small, efficien
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Atlanta’s 13-story Georgia Power
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Net Energy EfficiencySuperinsulated
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Why Are We Still Wasting So Much En
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How Can We Cool Houses Naturally? I
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AdvantagesFairly high netenergyWork
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The DOE calls the Great Plains stat
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AdvantagesLarge potentialsupply in
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surface. Researchers in several cou
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Primary EnergySourcesHydrogenProduc
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Bioenergy power plantsWind farmSmal
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Nuclear energy(fission and fusion)$
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19 andRisk, Toxicology,Human Health
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Number of individuals affectedVerys
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How Can We Estimate the Toxicity of
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dosage. With the threshold dose-res
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HormoneEstrogenlike chemicalAntiand
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19-4 BIOLOGICAL HAZARDS:DISEASE IN
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A typical virus consists of a shell
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For example, the West Nile virus ha
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eggs4. Parasite invadesblood cells,
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AgentContagiousSymptomsMortality(if
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Cause of DeathAnnual DeathsPoverty/
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■ How should limited funds be spe
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20 AirPollutionAirPopulationPolluti
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layer of rising and falling air cur
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Air Pollution in the Past: The Bad
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tems, most scientists say that it m
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UltrafineParticlesSea salt nucleiFi
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Warmer airInversion layerIncreasing
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4.75.45.14.75.25.35.35.55.95.54.75.
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when the soil pH falls below 5.1. E
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educe or eliminate emissions of SO
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FurnaceSlabSoilClothesdryerRadon-22
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How Many People Die Prematurely fro
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plant expansions, or sell them to o
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Cleaned gasElectrodesCleaned gasDir
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PreventionCover ceiling tilesand li
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21 andClimate ChangeOzone LossClima
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Average surface temperature (°C)Av
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380410Concentration of carbon dioxi
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Table 21-2 Major Characteristics of
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are dying because the permafrost un
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CellCloudsLandOceanAccording to the
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They suggest that this indicates th
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Agriculture• Shifts in food-growi
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ter temperatures in the Sierra Neva
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PreventionCut fossil fueluse (espec
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taxes on carbon emissions or fuel u
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What Can You Do?Reducing CO 2 Emiss
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Ultraviolet light hits a chlorofluo
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ozone in the stratosphere. From a h
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Abundance (parts per trillion)INDIV
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22 WaterPollutionWaterPollutionCont
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Table 22-2 Common Diseases Transmit
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Because point sources are at specif
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veloped countries. Two causes of th
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Nitrogen compoundsproduced by carsa
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ties of acids, pesticides, and othe
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ern India drink groundwater contami
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100 kilometers (62 miles) of the co
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Dumping industrial waste off U.S. c
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The key to protecting oceans is to
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PrimarySecondaryGritBar screen cham
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where bacteria break down remaining
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Officials are working to find ways
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It is a hard truth to swallow, but
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A weed is a plant whose virtues hav
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veloped countries, but use in devel
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U.S. Department of Agricultureresis
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What Goes Around CanCome AroundU.S.
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our bodies, and we should be concer
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U.S. Department of AgricultureAgric
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and opposition from agricultural ch
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Solid wastes are only raw materials
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24-2 PRODUCING LESS WASTEWhat Are O
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PharmaceuticalplantSludgeLocal farm
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matter and energy resources, cuts p
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Reduces globalwarmingReduces acidde
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xHOW WOULD YOU VOTE? Should househo
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Disposalwaste, pollutionUsebleach,d
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What Are the Advantages and Disadva
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What Harmful Chemicals Are in Your
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icals. Scientists are testing the u
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Most hazardous waste in the United
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PreventionPhase out leadedgasoline
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EPA advised women who may become pr
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When they can be found, responsible
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out use of these chemicals and to d
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25 SustainableCitiesBiodiversityEne
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Karachi10.4 million16.2 millionDhak
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Image provided courtesy of theU.S.
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InputsOutputsEnergyFoodWaterRawmate
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Despite joblessness, squalor, overc
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day—and injure another 15 million
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T rade-OffsMass Transit RailT rade-
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area (Figure 25-7) between 1862 and
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MajorhighwaysGreenbeltUrban centerS
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powered motorcycles by 2007, and is
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26 andEconomics, Environment,Sustai
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price matches what buyers are willi
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SunEARTHFigure 26-4 Ecological econ
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CostHighLowOptimum pollutionclean-u
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onment, their flow rates through th
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cluding costs, as much as possible,
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• Decreases depletion and degrada
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Should We Rely More on Tradable Pol
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Figure 26-14 Data on the global dis
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Microloans to the PoorMost of thewo
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Sunset BusinessesCoal miningOil pro
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27 andPolitics, Environment,Sustain
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ness, and environmental leaders and
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Leaders are persons whom other peop
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issue as the key to making governme
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LobbyistsLobbyistsLawmaking bodyPub
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19691970197119721973197419751976197
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noise to certain levels or to elimi
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The spearhead of the global conserv
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Such audits have resulted in numero
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natural capital. According to envir
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Speth and several other national an
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■ Open all discussions and findin
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7. Explain why you agree or disagre
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The main ingredients of an environm
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global economy with minimal governm
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What Is the Environmental WisdomWor
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onmental education. They cite some
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What Are Our Basic Needs?Obviously,
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new relationship with the earth tha
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APPENDIX 1UNITS OF MEASURELENGTHMet
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1930s 1940s 1950s1938 Federal Food,
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1970s1971Biologist BarryCommonerpub
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1991-2000Continuing efforts by anti
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OHcommon covalent compounds, formed
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A PPENDIX 4CLASSIFYING AND NAMING S
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GLOSSARYabiotic Nonliving. Compare
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CFCsSee chlorofluorocarbons.chain r
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timeters (10 inches) a year. Such a
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eutrophication Physical, chemical,
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high-throughput economy The situati
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distribution facilities. Compare hu
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and with atoms of one or more other
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adioactive decay Change of a radioi
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soil permeability Rate at which wat
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transmissible disease A disease tha
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