Umkhumbi wesitsha ukuthi uphathe amadada epulasitiki angaphezu kwamashumi amabili nane, yalahleka olwandle ngo-1992 futhi manje yilezo zinto zokudlala zepulasitiki eziqhubeka nokusondela osebeni lwengxenye yomhlaba.
Kwakungo-1992, lapho lowomkhumbi wezimpahla, owawunamadada epulasitiki angama-28.000 emabhalweni awo, wawushiya untanta olwandle ngenkathi maphakathi neHong Kong, idolobha asuka kulo, waya e-United States.
Akekho ngaleso sikhathi owayengacabanga ukuthi amanye amathoyizi epulasitiki ku-freighter ngabe usazintanta olwandle Eminyakeni engama-20 kamuva.
Kuze kube namuhla, leyo "mikhumbi yamadada epulasitiki" iyahalaliselwa ukwenza inguquko ku ukuqonda imisinga yolwandle, ngenkathi isifundisa into noma ezimbili mayelana nenqubo yokungcola kwepulasitiki, njengoba i-Independent ibonisa.
Kusukela ngalowo nyaka we-1992, ngenkathi zishiywa olwandle, amadada aphuzi ahamba ukwandisa emhlabeni wonke. Abanye baye babonwa besuka ogwini lwaseHawaii, i-Alaska, iNingizimu Melika, i-Australia, nePacific Northwest; ezinye zitholakale zifriziwe oLwandle i-Arctic. Ngenkathi abanye abaningi befika eScotland naseNewfoundland e-Atlantic.
Baze babe newebhusayithi lapho kunabantu khona thumela izithombe zamadada ezitholakala kuwo wonke amabhishi omhlaba, njengoba kusho uC Curtis Ebbesmeyer, isazi sezilwandle esathatha umhlalaphansi nomdlandla walawa mathoyizi alahlekile.
Kepha abadume kakhulu yi 2.000 ezisazungeza kumisinga yeNorth Pacific Gyre, i-vortex yemisinga exubanayo phakathi kweJapan, Southeast Alaska, kanye ne-Aleutian Islands ukuthi udwendwe lwamadada lusize ukukhomba.
Futhi kungenxa yabo ukuthi ikwazile ukubona le «vula». Futhi kungukuthi, kuze kube yileso sikhathi, bekufana yazi ukuthi kukhona iplanethi ohlelweni lwonozungezilanga, kepha lapho ungeke ukwazi ukusho ubukhulu bendlela ozungeza ngayo ilanga. Manje bayazi ukuthi kuthatha isikhathi esingakanani: iminyaka emithathu.
Namuhla iNorth Pacific Giro ibizwa ngokuthi yi Isigaxa Sokulahla Udoti Omkhulu WasePacific, eyodwa isiqhingi esikhulu semfucumfucu entantayo, engxenyeni enkulu yepulasitiki ephotha njengesobho esikhulu futhi esikhulu.
Okubi kunakho konke ukuthi namuhla kuyaziwa ukuthi kunezinhlobo eziyi-11 zalezi zinhlobo "zokusonteka" ezizungeze izilwandle zomhlaba nokuthi zingaba yisisekelo somhlaba kadoti esiguqula kuwo iplanethi. Kufana ne- I-Diogenes syndrome lapho umuntu uqoqa udoti nodoti endlini yakhe, kepha lapha, leyo ndlu yidolobhana lethu lomhlaba wonke, iplanethi yethu; okubuhlungu.