As negotiators approach a new climate change agreement in 2015, they should consider an often-overlooked category of legal provisions included in other multilateral environmental agreements: the Montreal Protocol on the Ozone Layer; the Convention on International Trade in Endangered Species; and the Basel Convention on Hazardous Wastes. Each include provisions committing their Parties to restrict trade with non-Parties in substances covered by the agreement. Experience with these provisions, which differs significantly in design and implementation, offers important lessons for how such a provision might be utilized to broaden American participation and deepen ambition in a new climate change agreement.