Abstract
Systematic reviews are a more complete, repeatable, and less biased form of literature reviews leading to evidence-based conclusions. A systematic review was conducted on articles that have investigated the trade of virtual gray water (VGW) and its effect on freshwater pollution in importer and exporter partners. Scopus and ScienceDirect databases were searched for journal articles covering VGW trade on global, international, and national scales. The relevant articles then were selected and using snowball approach led to more relevant articles. Then, the required data were extracted and recorded. A total of 34 articles met the inclusion criteria, of which 13 articles studied VGW trade on a national scale, 13 on an international scale, and the rest on a global scale. The present study developed a critical appraisal tool to evaluate the methodological quality of the included articles. The results of the critical appraisal showed that none of the included articles can undergo quantitative synthesis. Research gaps regarding VGW trade were observed in the water-scarce developing countries that need to be covered. One of the policy implications to reduce pollution impacts on water bodies would be agricultural and industrial reforms by VGW exporters. Besides, changes in economic structure in both sides of the trade, and goods or water consumption patterns, especially by VGW importers, can also play an important role in water resource conservation. Therefore, international and multi-stockholder cooperation should be taken to alleviate the environmental impacts of the VGW trade.
Published Version
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