WGUD199QuestionsAnswers

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WGUD199Questions&Answers 1.inthelast10,000years Answerhumansbeganmodifyingthelandsurfaceforgrowingfoodwithadventofagricultural revolution 2.theagriculturalrevolutionroughly Answercoincideswithawarminterglacialperiodthatbeganabout11,700yearsagowhichis calledtheHOLOCENEera(warmstableclimate) 3.thelast270yearsoftheholoceneusheredintothe AnswerINDUSTRIALREVOLU-TIONwhenclimatepollutionbegantoincreasedramatically 4.theindustrialrevolutionwaspoweredby Answerfossilfuels 5.whatbeganafterworldwarII? D199 WGU.pdffile:///C:/Users/HP/Desktop/New%20folder%20(4)/D199%20WGU.pdf

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Answerthegreatacceleration(1950-present) -causeddepletionintheozonelayer -After1950,thebiodiversityofspeciesstarteddecreasingandtheextinctionofspeciesaccelerated 6.TheGreatAccelerationmarksthebeginningof AnswerHomosapiens'trulymassiveglobalimprintontheplanet -Theclimatehasalreadywarmedby1°Csince1900.-Ifhumanscontinuewithbusiness-as-usualconsumptionoffossilfuels,thewarmingbetween 1900and2100couldexceed4°C.

7.thegreenhouseeffect.AnswerItisthistrappingofheatenergythatotherwisewouldhaveescapedtospacethrough theatmosphere -allowssolarradiationtoenter -theblanketeffect 8.isthegreenhouseeffectreal?Answer-Satellitesroutinelymeasuretheincomingsolarenergyandtheoutgoingheatenergy D199 WGU.pdffile:///C:/Users/HP/Desktop/New%20folder%20(4)/D199%20WGU.pdf

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fromtheplanet -Independently,theheatenergyemittedbythesurfacehasbeenestimatedusingobserved surfacetemperaturesonlandandsea.

9.aerosols Answer-Visiblesmokeandsmogaremadeupoftinyparticles -carbondioxideandothergreenhousegasescannotbeseenbythehumaneye -Mostoftheseaerosolsreflectsunlightandhaveacoolingeffect

• blackcarbonaerosols(amajorcomponentofsoot)

Answer-absorbsolarradiationenteringtheatmosphereandhaveawarmingeffect.-warmstheclimatebyabsorbingsolarenergyratherthaninfraredenergyfromtheplanet

• superpollutants

Answer-non-carbondioxidegreenhousegasesandblackcarbonparticles -permolecule,theirwarmingeffectsaremuchlargerthanthatofcarbondioxide.

• TheNorthernHemispherehaswarmedmorethantheSouthernHemi-sphere, D199 WGU.pdffile:///C:/Users/HP/Desktop/New%20folder%20(4)/D199%20WGU.pdf

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