The prolific literature on the relationship between the trade and environmental regimes suffers from three shortcomings. First, it myopically focuses on multilateral institutions while the vast majority of trade and environmental agreements are bilateral. Second, when studies consider preferential trade agreements’ (PTAs) environmental provisions, they are often limited to US and EU agreements. Third, it examines how the trade and environmental regimes negatively affect each other, leaving aside their potential synergies. Conversely, this article assesses the potential contribution of PTAs to international environmental law. Several PTAs include a full-fledged chapter devoted to environmental protection and contain detailed commitments on various environmental issue areas. One possible scenario is that countries that are dissatisfied with traditional settings for environmental lawmaking engage in a process of “regime shifting” toward PTAs to move forward on their environmental agenda. The alternative is that PTAs’ environmental provisions are the result of “tactical linkages” and merely duplicate extant obligations from international environmental law to serve political goals. We shed light on this question by building on two datasets of 690 PTAs and 2343 environmental treaties. We investigate four potential contributions of PTAs to environmental law: the diffusion of multilateral environmental agreements (MEAs), the diffusion of existing environmental rules, the design of new environmental rules, and the legal prevalence of MEAs. The article concludes that the contribution of PTAs to the strengthening of states’ commitments under international environmental law is very modest on the four dimensions examined.

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