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Commercial shipping has been implicated in over 60% of new introductions of invasive alien species (IAS) in the Great Lakes since 1960, with ballast water being the primary pathway. Recent policies have shifted the focus from postinvasion controls to prevention, with the regulation of oceanic ballast exchange as the primary approach. But this approach is not very effective, and it is often unsafe...
This paper presents a theoretical and empirical analysis of the impact of financial assistance to farms on crop biodiversity in an uncertain setting. The findings reveal that risk aversion is an important driving force for crop biodiversity conservation. Risk-averse farmers can hedge against the uncertainty they face by allocating land to different crop species. However, policies intended to stabilize...
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