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Initiatives certifying that producers of goods and services adhere to defined environmental and social-welfare production standards are increasingly popular. According to proponents, these initiatives create financial incentives for producers to improve their environmental, social, and economic performance. We reviewed the evidence on whether these initiatives have such benefits. We identified peer-reviewed, ex post, producer-level studies in economic sectors in which certification is particularly prevalent (bananas, coffee, fish products, forest products, and tourism operations), classified these studies on the basis of whether their design and methods likely generated credible results, summarized findings from the studies with credible results, and considered how these findings might guide future research. We found 46 relevant studies, most of which focused on coffee and forest products and examined fair-trade and Forest Stewardship Council certification. The methods used in 11 studies likely generated credible results. Of these 11 studies, nine examined the economic effects and two the environmental effects of certification. The results of four of the 11 studies, all of which examined economic effects, showed that certification has producer-level benefits. Hence, the evidence to support the hypothesis that certification benefits the environment or producers is limited. More evidence could be generated by incorporating rigorous, independent evaluation into the design and implementation of projects promoting certification.

This study analyzes the initial implementation of the Sustainable Slopes Program a voluntary environmental initiative established by the U.S. National Ski Areas Association in partnership with federal and state government agencies. Our findings indicate that participation of western ski areas in the Sustainable Slopes Program is related to institutional pressures in the form of enhanced federal oversight and higher state environmental demands exerted by state agencies, local environmental groups and public opinion. The analysis also suggests that, despite these institutional pressures, participant ski areas appear to be correlated with lower third-party environmental performance ratings. This behavior seems to reflect the lack of specific institutional mechanisms to prevent opportunism in the current design of the Sustainable Slopes Program. That is, the program does not involve specific environmental standards, lacks third-party oversight, and does not have sanctions for poor performance.• To identify factors and facility-level characteristics related to a firm's decision to participate in a voluntary environmental program 0162-895X

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