Nkatọ nke IPCC Fourth Assessment Report

Akuko nyocha nke anọ nke IPCC (AR4) bụ akụkọ gbasara mgbanwe ihu igwe emepụtara site n'enyemaka nke ọnụ ọgụgụ buru ibu nke ndị nyere aka, ma ndị ọkà mmụta sayensị na ndị nnọchi anya gọọmentị.  Enweela nnukwu esemokwu ndọrọ ndọrọ ọchịchị maka ntakịrị mperi nke achọpụtara na akụkọ ahụ, enwekwara oku maka nyocha nke usoro eji emepụta akụkọ ahụ.  Ọnụ ọgụgụ ka ukwuu nke ndị ọkà mmụta sayensị nwere ọkachamara na mgbanwe ihu igwe bụ na a na-edozi njehie, mgbe a chọtara ya, na okwu ndị a chọpụtara adịghị emebi nkwubi okwu nke akụkọ ahụ na usoro ihu igwe na-ekpo ọkụ n'ihi mmụba nke gas na-ekpo ọkụ, nke ka ukwuu.  n'ihi ọrụ mmadụ.[1].

.Ụfọdụ ndị na-ekiri ya achọpụtala ihe ndị sayensị nyochara ndị ọgbọ na-atụ aro ihe ga-esi na ya pụta dị njọ karịa ka akụkọ ahụ depụtara, ebe ndị ọzọ na-ekiri ihe na-ekwu na nkwubi okwu ụfọdụ na akụkọ ahụ akwadoghị nke ọma na sayensị ndị ọgbọ nyochara.  Otu Intergovernmental Panel on Climate Change (IPCC) ekwetala na otu paragraf dị na akụkọ WGII ​​kwuru gbasara ụbọchị agbaze nke glaciers Himalaya ezighi ezi.[1]  Ọkachamara ihu igwe Martin Parry, onye bụbu onye isi oche nke otu ndị na-arụ ọrụ na mmetụta maka IPCC AR4, kwuru na "Ihe malitere site na otu njehie na-adịghị mma banyere glaciers Himalaya aghọwo mkpọtụ na-enweghị ihe".  Ndị IPCC enyochala mmejọ ndị ọzọ eboro ebubo, bụ ndị "na-enweghị isi na oke na ntule ahụ", ma na-adaberekarị na echiche hiere ụzọ na IPCC enweghị ike iji akwụkwọ isi awọ dịka akụkọ sitere na otu mkpọsa na gọọmentị.

Atụmatụ IPCC AR4 na-ewepụ n'ụzọ doro anya mmetụta nke agbaze nke mpempe akwụkwọ akpụrụ akpụ.[1]  Ibé akwụkwọ ice ndị a gụnyere nke kachasị nke akwụkwọ ice ice Greenland, na ma akụkụ ọwụwa anyanwụ na ọdịda anyanwụ Antarctic ice, yana ọtụtụ glaciers.  Nke a nwere ike ime ka a na-elelị oke elu maka oke oke osimiri n'ime ogologo oge.  N'ihi na Arctic agbaze na Greenland ice mpempe akwụkwọ bụ nnọọ ngwangwa, na a nnyocha site climatologist James E. Hansen na-ekwu na "anyị enweghị ike ịchịkwa nnukwu mgbanwe on decadal time-scales ozugbo wide-ọnụ ọgụgụ elu gbazee bụ underway."[2] The agbaze agbaze bụ underway."  nke akwụkwọ ice nke Greenland ga-ebute mmụba nke ọkwa oke osimiri nke karịrị 7m.[3]  Agbaze nke ọdịda anyanwụ Antarctic mpempe akwụkwọ ice ga-eme ka ihe yiri ya, ma ọ bụrụ na ubé nta ịrị elu oké osimiri n'ihi na a na-ala n'okpuru oké osimiri, mgbe mmetụta nke agbaze nke ọwụwa anyanwụ Antarctic, ọ bụ ezie na obere ihe ga-ekwe omume ga-abụ usoro nke ukwuu.

In a lecture given at Princeton University, IPCC author Michael Oppenheimer admitted that the IPCC report could have better explained the contribution of melting ice sheets in predictions of sea level rise. Oppenheimer said that the IPCC Working Group II Summary for Policymakers (quoted below) managed this better than the Working Group I Summary for Policymakers: