https://en.m.wikipedia.org/wiki/Animal_husbandry
Animal husbandry has a significant impact on the world environment. Being a part of the animal–industrial complex, animal agriculture is the primary driver of climate change, ocean acidification, biodiversity loss, and of the crossing of almost every other planetary boundary, in addition to killing more than 60 billion non-human land animals annually.[77] It is responsible for somewhere between 20 and 33% of the fresh water usage in the world,[78] and livestock, and the production of feed for them, occupy about a third of the earth's ice-free land.[79] Livestock production is a contributing factor in species extinction, desertification,[80] and habitat destruction.[81] Animal agriculture contributes to species extinction in various ways and is the primary driver of the Holocene extinction.[82][83][84][85][86] Habitat is destroyed by clearing forests and converting land to grow feed crops and for animal grazing, while predators and herbivores are frequently targeted and hunted because of a perceived threat to livestock profits; for example, animal husbandry is responsible for up to 91% of the deforestation in the Amazon region.[87] In addition, livestock produce greenhouse gases. Cows produce some 570 million cubic metres of methane per day,[88] that accounts for from 35 to 40% of the overall methane emissions of the planet.[89] Livestock is responsible for 65% of all human-related emissions of the powerful and long-lived greenhouse gas nitrous oxide.[89]
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