With the further increase of global meat production, the impact of animal husbandry on the global greenhouse effect will also increase. At present, the land for animal husbandry has accounted for 30% of the earth's land area. Take up more land for fodder and grazing. In Latin America, 70% of the forest has been cleared to make room for pastures. The livestock industry currently poses a threat to 306 of the 825 terrestrial ecological zones worldwide. And threatened 1699 endangered species. The text is intended to explain:. ['Environmental costs of developing livestock.', 'The development of animal husbandry should be strictly controlled.', 'Bottlenecks in the development of animal husbandry.', 'Pollution caused by animal husbandry.']