Ngaba wakha wazibuza ukuba ezinye izinto eziphilayo ziya kuvela ukuze zibe nobukrelekrele bomgangatho womntu kwakude kudala emva kokuba abantu besishiyile esi sijikelezi-langa? Asiqinisekanga ngawe, kodwa sihlala sicinga iiraccoons kuloo ndima.
Mhlawumbi kwiminyaka ezigidi ezingama-70 ukusuka ngoku, usapho lweebhola ezigqunywe ubuso ziya kubuthelana phambi kweNtaba iRushmore, bebasa umlilo ngoobhontsi wabo ochasayo kwaye bezibuza ukuba zeziphi izidalwa eziqingqe lentaba. Kodwa, yima umzuzu, ngaba iNtaba iRushmore ingahlala ixesha elide kangako? Kwaye kuthekani ukuba siye sajika sibe ngama-raccoons?
Ngamanye amazwi, ukuba uhlobo oluhambele phambili kwezobuchwepheshe lulawula umhlaba malunga nexesha leedinosaurs, ngaba besiya kwazi ngayo? Kwaye ukuba ayizange yenzeke, sazi njani ukuba ayizange yenzeke?
Umhlaba ngaphambi kwexesha
Yaziwa ngokuba yi-Silurian Hypothesis (kwaye, hleze ucinge ukuba izazinzulu azizongqondo, zithiywe ngooGqirha ababuleweyo). Ithi abantu abazozidalwa zokuqala ezabakho kwisijikelezi-langa sethu yaye ukuba bekukho izinto ezandulelayo kwiminyaka eli-100 lezigidi eyadlulayo, phantse bonke ubungqina bazo ngebulahlekile ngoku.
Ukucacisa, umbhali wefiziksi kunye nophando-mbhali uAdam Frank wathi kwisiqwenga seAtlantiki, "Akuqhelekanga ukuba upapashe iphepha elinika ingcamango ongayixhasiyo." Ngamanye amazwi, abakholelwa kwi ubukho bempucuko yakudala yeeNkosi zeXesha kunye nabantu beLizard. Kunoko, injongo yabo kukufumanisa indlela esinokubufumana ngayo ubungqina bempucuko yakudala kwizijikelezi-langa ezikude.
Kungabonakala kunengqiqo ukuba sinokubona ubungqina bempucuko enjalo - emva kwayo yonke loo nto, iidinosaur zazikho kwiminyaka eyi-100 yezigidi eyadlulayo, kwaye siyakwazi oku kuba iifosili zabo zifunyenwe. Babekho, nangona kunjalo, malunga ne-150 yezigidi zeminyaka.
Ibalulekile loo nto kuba ayikokuba madala okanye ububanzi bamabhodlo ale mpucuko yentelekelelo. Ikwamalunga nokuba kudala kangakanani ikhona. Uluntu luye lwanda kwihlabathi lonke ngexesha elifutshane ngokumangalisayo - malunga neminyaka eyi-100,000.
Ukuba olunye uhlobo lwenze okufanayo, amathuba ethu okuyifumana kwingxelo yokwakheka komhlaba ebeya kuba mancinane kakhulu. Uphando olwenziwa nguFrank kunye nombhali-mbhali weclimatologist uGavin Schmidt lujolise ekuchongeni iindlela zokubona impucuko yexesha elinzulu.
Inaliti kwi-haystack
Mhlawumbi akuyomfuneko ukuba sikwazise ukuba abantu sele benempembelelo yexesha elide kokusingqongileyo. Iplastiki iya kubola ibe yi-microparticles eya kufakwa kwi-sediment kwiminyaka eyiwaka njengoko iyancipha.
Nangona kunjalo, nokuba bahlala ixesha elide, kunokuba nzima ukufumana i-microscopic stratum yamaqhekeza eplastiki. Endaweni yoko, ukukhangela amaxesha okunyuka kwekhabhoni emoyeni kunokuba nesiqhamo ngakumbi.
Umhlaba okwangoku ukwixesha le-Anthropocene, elichazwa lulawulo lomntu. Ikwahlukaniswa nokunyuka okungaqhelekanga kweekhabhoni zomoya.
Oko akuthethi ukuba kukho ikhabhoni eninzi emoyeni kunanini na ngaphambili. I-Paleocene-Eocene Thermal Maximum (PETM), ixesha lamaqondo obushushu aphezulu ngokungaqhelekanga kwihlabathi, lenzeka kwiminyaka eyi-56 yezigidi eyadlulayo.
Kwiipali, iqondo lobushushu lalifikelela kuma-70 ngokukaCelsius. Kwangaxeshanye, kukho ubungqina bokwanda kwamanqanaba eefosili carbons emoyeni-ezona zizathu zingaziwayo. Oku kwakhiwe kwekhabhoni kwenzeka kwithuba lamakhulu amawaka eminyaka. Ngaba obu bubungqina obushiywe yimpucuko ehambele phambili kwixesha langaphambili? Ngaba ngokwenene umhlaba wazibonela into enjengale ngaphandle kokuyicinga?
Umyalezo wolu phononongo onika umdla kukuba, enyanisweni, kukho ubuchule bokukhangela impucuko yamandulo. Ekuphela kwento ekufuneka uyenzile kukukama ngeentsimbi zomkhenkce ngokufutshane, ukugqabhuka okukhawulezayo kwekharbon diokside - kodwa "inaliti" abaya kuyikhangela kule haystack kuya kuba lula ukuyiphosa ukuba abaphandi bebengayazi into abayikhangelayo. .
