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2011专业硕士英语 Unit4TooManyPeople.ppt

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Unit4TooManyPeopleTooMuchTraffic→JamTomorrow?BackgroundInformationBackgroundInformation1:OverpopulationOverpopulation:anism’,thetermoftenreferstotherelationshipbetweenthehumanpopulationanditsenvironment,:◆anincreaseinbirths,adeclineinmortalityratesduetomedicaladvances◆anincreaseinimmigration◆anunsustainablebiomeanddepletionofresourcesTheresourcestobeconsideredwhenevaluatingwhetheranecologicalnicheisoverpopulatedincludecleanwater,cleanair,food,shelter,warmth,,theremaybeadditionalresourcesconsidered,suchasmedicalcare,education,,:,,,snowandthewindchill,forecastscanbeusedtoplanactivitiesaroundtheseevents,:TrafficJam/ursasuseofvehiclesincreases,andischaracterizedbyslowerspeeds,longertriptimes,,-readingQuestions3:Somesuggestions:→restrictcaruses

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