Mmetụta gburugburu ebe obibi nke ọrụ ugbo anụmanụ

Ọrụ ụgbọ anụmanụ bụ ihe dị mkpa n'enye aka na ikuku n'ekpo ọkụ. Ehi, atụrụ, na anụ ndị ọzọ n'eri nri n'agbari nri ha site na fermentation enteric, na burps ha bụ isi ihe n'eme ka ikuku methane si n'iji ala eme ihe, mgbanwe ala, na ọhịa. Tinyere methane na nitrous oxide sitere na nsị, nke a n'eme ka anụ ụlọ bụrụ isi iyi nke gas n'ekpo ọkụ site na ọrụ ụgbọ. Mbelata dị ịrịba ama n'ihe oriri anụ dị mkpa iji belata mgbanwe ịhụ igwe, ọkachasị ka ọnụ ọgụgụ mmadụ n'abawanye site na ijeri 2.3 site n'etiti narị afọ.
Ọtụtụ nnyocha achọpụtala na mmụba nke oriri anụ n'ejikọta ugbụa na mmụwanye nke ọnụ ọgụgụ mmadụ na mmụcha nke ego onye ọ bụla ma ọ bụ GDP, ya mere, mmetụta gburugburu ebe obibi nke mmepụta anụ na oriri ga-abawanye ma ọ bụrụ na omume ugbu a gbanwere.Carrington, Damian (October 10, 2018). "Huge reduction in meat-eating 'essential' to avoid climate breakdown". The Guardian. Retrieved October 16, 2017.

Mgbanwe na ọchịchọ maka anụ ga na-emepụta, si otú a n'agbanwe mmetụta gburugburu ebe obibi nke mmepụta anụ. E mere atụmatụ na oriri anụ zụrụ ụwa ọnụ nwere ike okpụkpụ abụọ site n'afọ 2000 ruo n'afọ 2050, nke kachasị n'ihi mmụba nke ọnụ ọgụgụ mmadụ n'ụwa, kamakwa n'akụkụ ụfọdụ n'ihi ịrị elu nke oriri anụ kwa onye (nke ọtụtụ n'ime mmụba oriri kwa onye n'eme na mba ndị n'emepe emepe). FAO. 2006. World agriculture: towards 2030/2050. Prospects for food, nutrition, agriculture and major commodity groups. Interim report. Global Perspectives Unit, United Nations Food and Agriculture Organization. 71 pp. A n'atụ anya na Ọnụ ọgụgụ mmadụ ga-eto rụọ ijeri 9 ka ọ na-erule n'afọ 2050, a n'atụkwa anya na mmepụta anụ ga-abawanye site na pasent 40. Mmepụta zụrụ ụwa ọnụ na oriri nke anụ ọkụkọ anọwo n'eto n'oge na-adịbeghị anya na ihe karịrị 5% kwa afọ. Nri anụ n'abawanye ka ndị mmadụ na mba n'aba ọgaranya. Omume n'adịgasị iche n'etiti ngalaba anụ ụlọ. Dịka ọmụmaatụ, oriri ezì zụrụ ụwa ọnụ maka otu onye amụbaala n'oge n'adịbeghị anya (ihe fọrọ nke nta ka ọ bụrụ mgbanwe na oriri n'ime China), ebe oriri ezì kwa onye n'eri anụ n'ebelata.
For every 100 kilograms of food made for humans from crops, 37 kilograms byproducts unsuitable for direct human consumption are generated.  Many countries then repurpose these human-inedible crop byproducts as livestock feed for cattle. Raising animals for human consumption accounts for approximately 40% of total agricultural output in industrialized nations. Moreover, the efficiency of meat production varies depending on the specific production system, as well as the type of feed. It may require anywhere from 0.9 and 7.9 kilograms of grain to produce 1 kilogram of beef, between 0.1 to 4.3 kilograms of grain to produce 1 kilogram of pork, and 0 to 3.5 kilograms of grains to produce 1 kilogram of chicken.