单一的全球变暖潜在影响评估是否足以衡量农业食品系统的碳足迹?
Graham A McAuliffe1, John Lynch2, Michelle Cain3
1Net Zero and Resilient Farming, Rothamsted Research, North Wyke, Okehampton, Devon EX20 2SB, United Kingdom.
Environmental research letters : ERL [Web site]
|July 20, 2023
概括
对农业食品可持续性的气候影响评估进行比较至关重要. 与静态指标不同,GWP*提供了更完整的温室气体排放 (如甲) 温度变化的图景.
科学领域:
- 环境科学 环境科学
- 气候变化评估评估
- 农业可持续性 农业可持续性
背景情况:
- 农业食品的生命周期评估 (LCAs) 通常仅依赖于全球变暖潜力 (GWP100).
- 这种方法因其"跨界"的应用而受到越来越多的批评,特别是对于富含甲的系统.
- 为了更细致的评估,正在考虑使用全球温度变化潜力 (GTP) 和GWP*等替代指标.
研究的目的:
- 进行大规模的敏感性分析,比较不同的气候影响评估指标.
- 以牧场为例的牛肉生产系统来评估这些指标.
- 展示衡量标准选择对农业食品系统可持续性解释的影响.
主要方法:
- 进行了一项灵敏度分析,比较使用GWP100和GTP100的二氧化碳等价值和使用GWP*的二氧化碳升温等价值.
- 这项研究利用了来自英国德文的北维克农场平台的库存,代表了高甲排放的牛肉系统.
- 分析的重点是比较不同温室气体排放的温度变化的时间演变.
主要成果:
- 气候影响评估的选择大大改变了结果的解释.
- 由于甲 (CH4) 在二氧化碳等价物中的处理方式不同,GWP100和GTP100的结果截然不同.
- GWP*与气候模型的对应性更强,为温度变化提供了更完整的时间图像.
结论:
- 像GWP100这样的静态排放指标具有局限性,特别是在甲密集型系统中.
- 与GWP100和GTP100相比,GWP*提供了更为动态和全面的气候影响评估.
- 农业食品可持续性实践者应仔细考虑动态方法和额外的信息,以提供在农业食品可持续性方面的强有力的决策支持.
相关概念视频
01:16What is Climate?
18.7K
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
18.7K
01:50Global Climate Change
24.5K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.5K
01:57Adaptations that Reduce Water Loss
25.8K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.8K
01:28Global Regulatory Systems
44
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
44
01:46The Calvin Benson Cycle
4.6K
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
4.6K
01:27Microorganisms in Agriculture and Food industry
88
Microorganisms play a crucial role in agriculture and the food industry, contributing to soil fertility, crop protection, and food production. Their functions range from nitrogen fixation and biopesticide production to fermentation and food preservation, making them indispensable to sustainable farming and food safety.Role in AgricultureNitrogen-fixing bacteria, such as Rhizobium (symbiotic) and Azotobacter (free-living), convert atmospheric nitrogen into ammonia through biological nitrogen...
88