首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
Supplying our world's growing nutrition needs in more sustainable ways has become an urgent global imperative, given the constraints of finite resources and the challenges of accelerating climate change. We present national-level eco-efficiency metrics in several representative production countries during the most recent decade (2000–2010) for four important crops: canola, cotton, maize, and soybeans. The metrics address greenhouse gas emissions and the utilization of land, water, and energy – all calculated per unit of production. We group countries based on their level of agricultural intensification and find that high-intensification countries are achieving the highest and yet still increasing levels of eco-efficiency, with these decadal gains: canola (26%), cotton (23%), maize (17%), and soybeans (18%). By stark contrast, low-intensification countries had no change in eco-efficiency during this same decade. Overall, our results suggest large opportunities for additional improvements in the developing world, and that cumulative resource savings through intensification have been significant. For instance, in the case of irrigated maize, if the high- and medium-intensification production countries had only achieved the same irrigation water-use efficiency as in the low-intensification countries, approximately 4 quadrillion (4×1015) more litres of irrigation water would have been consumed during the period 2000–2010.  相似文献   

3.
4.
5.
6.
7.
Many low-income countries are integrated into apparel global value chains through foreign direct investment (FDI), including Lesotho, which has become the largest Sub-Saharan African apparel exporter to the US under the African Growth and Opportunity Act. More recently, South Africa has emerged as a new apparel export market in Lesotho. The two markets are supplied by different types of FDI firms – affiliates of Taiwanese transnational producers and South African manufacturers – which are part of different value chain variants. The paper assesses the implications for industrial upgrading and development of integration into these two value chain variants in Lesotho, drawing on firm-level and institutional interviews. We show that their different characteristics in terms of investors’ motivation, governance structure, end markets, firm set up and most importantly and causally, ownership and embeddedness have crucial impacts on functional, product and process upgrading, local linkages, and skill development.  相似文献   

8.
9.
10.
11.
This paper examines Latin America’s economic performance in the last three decades with the objective of assessing whether it entered a new phase of strong and persistent growth with stabilization in the 2000s. Our analysis pays special attention to the changing roles of exports and investment as drivers of growth and to the region’s performance in the fiscal area, the composition and dynamics of foreign trade, investment and labour productivity. Our results indicate that, in general, the region has achieved important progress in macroeconomic matters, but it has failed to overcome major structural, long-term constraints linked to its balance of payments and to a lesser extent its fiscal performance. Unless these challenges are resolved, the region’s long-term growth will hardly be favourable.  相似文献   

12.
13.
As concern grows regarding urban sprawl and forest and agricultural land preservation, the effectiveness of land-use policies in shaping land-use change warrants further study. We evaluate the impact of county-level zoning laws, the most predominant land use policy in the USA, and land rents on the relative amounts of forest, agricultural, and developed land, while controlling for demographic information and taxation rates. Over the past decades, southern Indiana has experienced forest regrowth on private lands, but this regrowth has declined in recent years with increased conversion of open space for urban residential development. We develop a model of land-use shares in 40 southern Indiana counties based on the net benefits to agriculture, forestland, and urban uses using a maximum likelihood estimation of a Dirichlet distribution. We find agricultural land rent and indicators of land productivity are the most important predictors of the proportion of agriculture and urban uses. Forest use is better explained by shifting regional economic structure and hilly terrain. Counties with a greater proportion of their work force in the service sectors have a greater proportion of land forested. Finally, to some extent zoning may protect agricultural land in the region, although land rents, land characteristics, and population are strong predictors of the ratio of agriculture to urban use.  相似文献   

14.
China's sustained rapid economic growth and development has contributed to the surge in consumption and production of livestock in that country  termed the livestock revolution. Consumption trends are first reviewed, and changes in food consumption patterns include a marked shift away from grains and towards meats and dairy products. A question is to what extent this rapid increase in demand for livestock products is reflected in China's agri‐food trade statistics? While her agri‐food imports have dramatically increased since China's accession to the WTO, livestock products have not made a noticeable contribution, although the import of certain animal feedstuffs has. This implies China's continuing self‐sufficiency in most livestock products. The paper next considers developments in China's livestock farming sector and policies that have been contributing to these supply‐side developments. The paper concludes with an examination of issues that may be important to the future development of China's, and the world's, livestock situation;  this includes future demand developments, and the question of whether future demand growth in China might be met with local production, imports of final product, and/or imports of feedstuffs.  相似文献   

15.
16.
17.
18.
19.
20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号