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美国奶牛农场与全球变暖

C Alan Rotz¹, Frank Mitloehner²

¹Agricultural Research Service, USDA, University Park, PA 16802.

Journal of dairy science

|December 19, 2024

概括

选择正确的温室气体指标会对奶牛场的评估产生重大影响. 像CGTP和GWP*这样的新指标提供了对乳制品的更准确的看法.

科学领域:

环境科学环境科学
农业科学农业科学
气候科学气候科学

背景情况:

温室气体 (GHG) 指标对于评估乳制品生产等农业系统对气候的影响至关重要.
标准的100年全球变暖潜力 (GWP-100) 对长寿命气体的权重更大,可能会误解甲等短寿命气体的影响.
替代指标如全球温度变化潜力 (GTP),综合全球温度变化潜力 (CGTP) 和全球变暖潜力星 (GWP*) 提供了对变暖影响的不同视角.

研究的目的:

评估不同的温室气体指标如何影响美国乳制品生产系统的生命周期评估和比较.
用GWP-100与基于温度的指标 (GTP,CGTP,GWP*) 来比较乳制品农场的变暖影响.
根据各种指标分析乳制品农场随时间变暖影响的趋势及其对国家排放的贡献.

主要方法:

计算了美国乳制品农场的农场门排放强度,使用20年,100年和500年时间范围的GWP指标.
使用GWP指标与基于温度的指标 (GTP,CGTP,GWP*) 对比甲与其他温室气体的相对变暖效应.
通过使用不同的指标,评估了1971年至2020年间奶牛场变暖影响和国家排放贡献的变化.

主要成果:

排放强度随着所选择的时间范围而显著变化 (例如,0.50至2.08公斤CO2-eq/公斤FPCM).
基于温度的指标 (GTP,CGTP,GWP*) 与GWP-100相比,将美国乳制品农场的预计变暖效应降低了17%-49%.
从1971年到2020年,GWP-100显示乳制品农场的变暖增加了11%至15%,而GTP,CGTP和GWP*显示几乎没有变化.
乳制品的温室气体排放量占2020年美国总排放量的1.6%,使用GWP-100,与其他指标的0.9%1.8%相比.

结论:

选择温室气体指标对生命周期评估和乳制品生产对气候影响的感知有重大影响.
考虑甲大气衰变速度的CGTP和GWP*等指标,提供了对长期温度影响的更多基于过程的评估.
这些先进的指标可能为开发减缓乳制品农场变暖影响的减缓策略提供更科学的基础.

关键词:

他们的碳足迹.牛奶农场牛奶农场牛奶农场全球变暖全球变暖温室气体的温室气体是什么

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