نتایج جستجو برای: virtual water exports

تعداد نتایج: 700909  

2015
Qian Dang Xiaowen Lin Megan Konar

Trade plays an increasingly important role in the global food system, which is projected to be strained by population growth, economic development, and climate change. For this reason, there has been a surge of interest in the water resources embodied in international trade, referred to as ‘‘global virtual water trade.’’ In this paper, we present a comprehensive assessment of virtual water flow...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2012
Carole Dalin Megan Konar Naota Hanasaki Andrea Rinaldo Ignacio Rodriguez-Iturbe

Global freshwater resources are under increasing pressure from economic development, population growth, and climate change. The international trade of water-intensive products (e.g., agricultural commodities) or virtual water trade has been suggested as a way to save water globally. We focus on the virtual water trade network associated with international food trade built with annual trade data...

Hamid Tavakoli Ghouchani, Yasaman Jafari, Yekta Rahimi,

The COVID-19 pandemic has become a major health problem that has had negative impacts on various aspects of people's lives. This study aimed to present a narrative review of reviews that have addressed the social effects of the COVID-19 epidemic. To achieve this goal, the Pubmed database was searched using keywords related to the fields of social implication, COVID-19, and review studies. Final...

2014
Sujay S. Kaushal Paul M. Mayer Philippe G. Vidon Rose M. Smith Michael J. Pennino Tamara A. Newcomer Shuiwang Duan Claire Welty

Nonpoint source pollution from agriculture and urbanization is increasing globally at the same time climate extremes have increased in frequency and intensity. We review >200 studies of hydrologic and gaseous fluxes and show how the interaction between land use and climate variability alters magnitude and frequency of carbon, nutrient, and greenhouse gas pulses in watersheds. Agricultural and u...

2016
Werner Kristjanpoller Josephine E. Olson Rodolfo I. Salazar

Commodity prices are characterized by boom and bust cycles. In this article, the impact of the commodity boom of the 2000s on Latin American and Caribbean economies is studied by analyzing four categories of commodity exports (agricultural raw materials, fuel, food, ore and minerals) as well as manufactured exports. Latin American and Caribbean economies had higher growth during the 2000s than ...

Journal: :Journal of environmental quality 2010
David Nash Murray Hannah Fiona Robertson Penny Rifkin

Best management practices are often used to mitigate nutrient exports from agricultural systems. The effectiveness of these measures can vary depending on the natural attributes of the land in question (e.g., soil type, slope, and drainage class). In this paper we use a Bayesian Network to combine experiential data (expert opinion) and experimental data to compare farm-scale management for diff...

2005
Paresh Kumar Narayan Russell Smyth

This article employs cointegration and error-correction modelling to test the causal relationship between real income, exports and human capital stock using data for China over the period 1960 to 1999. We find that real exports, human capital and real income are cointegrated when real exports is the dependent variable, but are not cointegrated when human capital or real income are the dependent...

2002
Mihir A. Desai James R. Hines

This paper examines the effect of value-added taxes (VATs) on international trade. Destination-based VATs are commonly thought to encourage exports, since exports are exempt from tax while imports are taxed. Economic theory implies that exchange rate adjustment prevents destination-based VATs from affecting exports and imports, since exchange rate appreciation completely undoes the effects of i...

Journal: :آب و توسعه پایدار 0
محمود خرمی وفا مهدی نوری فرزاد مندنی هادی ویسی

the study of virtual water and water productivity in agricultural crops requires the establishment of relations where represent the actual amount of water in order to produce the respective crop. this feature presents a new approach in studies regarding agricultural ecology. this survey evaluates the virtual water, water productivity and ecological water footprint of wheat and corn fields in th...

2012
Shuiwang Duan Sujay S. Kaushal Peter M. Groffman Lawrence E. Band Kenneth T. Belt

[1] Watershed export of phosphorus (P) from anthropogenic sources has contributed to eutrophication in freshwater and coastal ecosystems. We explore impacts of watershed urbanization on the magnitude and export flow distribution of P along an urban-rural gradient in eight watersheds monitored as part of the Baltimore Ecosystem Study Long-Term Ecological Research site. Exports of soluble reactiv...

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