Cov Tsiaj Noog Tsuag Qhia Qhov Phem Kom Qhov Teeb Meem Tsuag Ntau Dua Ntawm 120 Xyoo, Txoj Kev Kawm Tshiab Hais

2024 Tus sau: Daisy Haig | [email protected]. Kawg hloov kho: 2023-12-17 03:09

WASHINGTON - Cov pawg sau los ntawm Pacific seabirds tsawg kawg nyob rau 120 xyoo dhau los tau pom tias muaj ntau hom taug txhuas lom uas yuav tshwm sim los ntawm tib neeg cov pa phem, Tebchaws Asmeskas cov kws tshawb fawb tau hais rau hnub Monday.

Cov kws tshawb fawb hauv Harvard University tau muab cov piv txwv los ntawm cov tsiaj uas yog cov muaj cov kab mob ua rau cov kab mob dub-ntev los ntawm ob lub Tebchaws Asmeskas cov tsev khaws puav pheej, hais tias txoj kev tshawb nrhiav hauv Kev Kawm Txuj Ci ntawm National Academy of Sciences.

Cov plaub, uas tau sau txij hnub 1880 txog 2002, qhia "nce ntau ntawm cov methylmercury uas feem ntau ua raws li keeb kwm thoob ntiaj teb thiab tsis ntev los no thaj av nce hauv anthropogenic mercury emissions," txoj kev tshawb no hais.

Methylmercury yog ib qho neurotoxin uas tuaj yeem ua rau lub hauv nruab nrab cov hlab hlwb puas thiab ua rau los ntawm cov roj faus hluav taws.

Kev nce qib ntau ntawm mercury hauv cov ntses thiab nqaij nruab deg ntseeg tias yuav ua rau muaj kev phom sij rau tib neeg kev noj qab haus huv, thiab cov poj niam cev xeeb tub thiab menyuam yaus yog cov xav tau tshwj xeeb kom txo qee tus ntses nyob hauv lawv cov zaub mov.

"Siv cov keeb kwm plaub noog cov plaub, nyob rau hauv ib txoj kev, sawv cev rau lub cim xeeb ntawm cov dej hiav txwv," hais txog kev sib koom tes ntawm tus kws tshawb fawb Michael Bank, tus kws tshawb nrhiav kev koom tes hauv Lub Tsev Haujlwm Saib Xyuas Kev Noj Qab Haus Huv ntawm Harvard Tsev Kawm Ntawv Kev Noj Qab Haus Huv.

"Peb qhov kev tshawb pom tau ua lub qhov rais rau keeb kwm thiab tam sim no ntawm Pacific, yog ib qho chaw tseem ceeb rau tib neeg," Bank hais.

Qhov kev siab tshaj plaws hauv cov tsiaj tau txuas nrog kev cuam tshuam los ntawm cov noog nyob rau lub sijhawm tom qab lub sijhawm xyoo 1990, uas tau sib luag nrog cov pa phem tsis ntev los no los ntawm cov pa roj carbon emissions hauv thaj av Pacific, txoj kev tshawb no.

Cov pa phem Mercury los ntawm Asia dhau los ntawm kwv yees li 700 tons txhua xyoo nyob rau xyoo 1990 txog rau 1, 290 tons hauv 2005, txoj kev tshawb no tau hais tias, Tuam Tshoj ua tus emitter ntau tshaj plaws ntawm cov pa phem nyob rau xyoo 2005 nrog 635 tons.

Pre-1940 theem ntawm cov mercury nyob hauv cov noog cov noog tau qis tshaj plaws hauv kev tshawb nrhiav.

Tus kab dub-footed albatross tau teev tseg raws li yuav ploj mus los ntawm International Union for Conservation of Nature, uas kwv yees li ntawm 129, 000 ntawm lawv nyob hauv sab qaum teb Pacific, feem ntau nyob ze Hawaii thiab Nyij Pooj.

Cov noog noj feem ntau ntawm cov ntses, ntses qe, squid thiab crustaceans.

Kev kawm muaj mercury ntau nyob hauv lawv cov plaub yuav qhia tau qhov sib txuas ntawm lawv cov zaub mov muaj mercury siab thiab lawv cov lej tsawg zuj zus, qhov kev tshawb fawb no tau hais tseg.

"Tau muab ob qho theem siab ntawm cov methylmercury uas peb ntsuas hauv peb cov piv txwv tsis ntev tas los no thiab cov av ntawm kev tso pa tawm ntau, mercury bioaccumulation thiab cov tshuaj lom yuav ua rau muaj kev tawm tsam ntawm cov tsiaj no thiab lwm cov muaj sia ntev, muaj dej hiav txwv,", kawm tiav kev kawm ntawm University of California, Berkeley.

Lub tsev txhab nyiaj ntxiv hais tias "muaj kuab paug mercury thiab nws cov kuab lom hauv thaj tsam ib puag ncig tuaj yeem yog qhov tseem ceeb ntawm cov tsiaj tsawg."