保持食品系统在环境限制中的选择
Marco Springmann1,2, Michael Clark3, Daniel Mason-D'Croz4,5
1Oxford Martin Programme on the Future of Food, Oxford Martin School, University of Oxford, Oxford, UK. marco.springmann@dph.ox.ac.uk.
Nature
|October 12, 2018
概括
全球粮食系统对环境产生重大影响,导致气候变化和资源枯竭. 如果没有缓解,到2050年,它的影响可能会超越行星的边界,
科学领域:
- 环境科学
- 粮食系统分析
- 气候变化研究
背景情况:
- 目前的粮食系统是全球环境退化的主要原因.
- 它推动了气候变化,土地利用变化,淡水枯竭和生态系统通过和的污染.
- 如果不进行干预,预计的人口和收入增长将加剧这些影响.
研究的目的:
- 量化到2050年的粮食系统对环境的影响.
- 评估减轻粮食系统对环境的影响的策略.
- 评估将环境影响保持在地球边界内的可行性.
主要方法:
- 预测人口和收入变化的分析.
- 食品系统对环境的影响的建模 (气候变化,土地使用,水,营养污染).
- 评估减轻风险的方案:饮食转变,技术改进,减少食物浪费.
主要成果:
- 根据目前的趋势,在2010年至2050年期间,食品系统对环境的影响可能会增加50-90%.
- 预计的撞击可能会超过关键的行星边界.
- 没有一个单一的缓解措施是足够的.
结论:
- 改变饮食,技术进步和减少食物损失的协同作用至关重要.
- 确保地球范围内可持续的粮食系统需要紧急和综合战略.
- 解决粮食系统的环境压力对于人类的安全运作空间至关重要.
相关概念视频
Limiting Reactant
70.1K
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.
70.1K
The Number e as a Limit
87
The number e is a fundamental constant in calculus, playing a central role in describing continuous change, particularly exponential growth. It is most naturally defined through its relationship with the natural logarithm, which is the inverse of the exponential function with base e. This relationship allows e to be characterized using basic principles of differentiation rather than as an arbitrary numerical constant.A key property of the natural logarithm function, ln x, is that its derivative...
87
Types of Limits I
185
Limits are a key mathematical concept for understanding how functions behave as their input approaches specific values, particularly when the function is undefined. They help reveal trends and discontinuities by examining the values a function approaches rather than its actual value.One-sided limits focus on the direction from which a value is approached. When a function behaves differently depending on whether the input approaches from the left or the right, the two one-sided limits may not...
185
Limit Laws I
226
Limit laws provide essential tools for analyzing how functions behave as their input approaches a specific value. These laws are particularly useful when dealing with combinations of functions, provided the individual limits exist. The Sum and Difference Laws state that the limit of the sum or difference of two functions equals the sum or difference of their respective limits:The Product Law asserts that the limit of the product of two functions equals the product of their individual limits:A...
226
Limits at Infinity
325
The function that decreases as the input becomes very large provides a clear example of how mathematical functions can behave at extreme values. When the input increases continuously, the output becomes smaller and smaller, getting closer to a particular fixed value. Although the output never actually reaches this value, it moves nearer to it without limit. This behavior is a fundamental concept in understanding how functions behave as the input grows indefinitely. The graphical representation...
325
Introduction to Limits
244
A limit describes the value a function approaches as its input moves closer to a particular point. Even when a function is undefined at a specific value, limits allow us to analyze its behavior near that point. This concept is fundamental in calculus and essential for understanding continuity, derivatives, and integrals.Mathematically, a function f(x) has a limit L at x = a if its values L approach x as x gets arbitrarily close to a. This is written as:This notation expresses that the function...
244


