Dyson T
Department of Social Policy, London School of Economics, London WC2A 2AE, United Kingdom.
Proc Natl Acad Sci U S A. 1999 May 25;96(11):5929-36. doi: 10.1073/pnas.96.11.5929.
This paper reviews food (especially cereal) production trends and prospects for the world and its main regions. Despite fears to the contrary, in recent years we have seen continued progress toward better methods of feeding humanity. Sub-Saharan Africa is the sole major exception. Looking to the future, this paper argues that the continuation of recent cereal yield trends should be sufficient to cope with most of the demographically driven expansion of cereal demand that will occur until the year 2025. However, because of an increasing degree of mismatch between the expansion of regional demand and the potential for supply, there will be a major expansion of world cereal (and noncereal food) trade. Other consequences for global agriculture arising from demographic growth include the need to use water much more efficiently and an even greater dependence on nitrogen fertilizers (e.g., South Asia). Farming everywhere will depend more on information-intensive agricultural management procedures. Moreover, despite continued general progress, there still will be a significant number of undernourished people in 2025. Signs of heightened harvest variability, especially in North America, are of serious concern. Thus, although future general food trends are likely to be positive, in some respects we also could be entering a more volatile world.
本文回顾了全球及其主要地区的粮食(特别是谷物)生产趋势与前景。尽管有人持相反担忧,但近年来我们在养活人类的更好方法方面持续取得进展。撒哈拉以南非洲是唯一的主要例外。展望未来,本文认为,持续近期的谷物产量趋势应足以应对到2025年之前因人口增长导致的大部分谷物需求增长。然而,由于区域需求增长与供应潜力之间的不匹配程度日益加剧,世界谷物(以及非谷物食品)贸易将大幅扩张。人口增长给全球农业带来的其他影响包括更高效用水的需求以及对氮肥的更大依赖(例如在南亚)。各地农业将更多地依赖信息密集型农业管理程序。此外,尽管总体上持续取得进展,但到2025年仍会有大量营养不良人口。收成波动加剧的迹象,尤其是在北美,令人严重担忧。因此,尽管未来总体粮食趋势可能是积极的,但在某些方面我们可能也正进入一个更不稳定的世界。