美国草牛肉与工业牛肉一样碳密集,比常见的蛋白质密集替代品密集约10倍
Gidon Eshel1, Avi I Flamholz2, Alon Shepon3
1Department of Environmental Science, Bard College, Annandale-on-Hudson, NY 12504-5000.
概括
草牛肉生产不是工业牛肉的低碳替代品. 即使有土壤封存的好处,草牛肉每公斤蛋白质的温室气体排放量比工业牛肉和植物替代品更高.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 气候变化研究 气候变化研究
背景情况:
- 工业牛肉生产是资源密集型的,引发了人们对草牛肉等影响较低的替代品的兴趣.
- 由于农业强度和地理位置的差异,量化草牛肉对环境的好处需要严格的分析.
研究的目的:
- 为了量化草食牛肉生产的温室气体排放.
- 将草牛肉的碳强度与工业牛肉和植物性替代品进行比较.
主要方法:
- 将经验证据与基于肉牛表现方程的模型集成.
- 模拟各种草食作业,从广泛的牧场到密集的环境.
- 每公斤蛋白质的温室气体排放量量化,包括土壤封存效应.
主要成果:
- 每公斤蛋白质的草牛肉排放量比美国工业牛肉高10-25%.
- 排放量比植物和动物替代品高3到40倍以上.
- 即使有最大的土壤封存信用,草牛肉仍然比工业牛肉更碳密集,而且比非牛肉替代品要多得多.
结论:
- 草食牛肉生产并不是工业牛肉的碳密集性更低的替代品.
- 草牛肉对环境的好处,包括土壤封存,并不能抵消其更高的温室气体排放.
- 植物性和其他非牛肉替代品的碳足迹显著降低.
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