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The political linkages between trade and environmental policy have rapidly increased since 1990. In this paper, I suggest a novel mechanism behind this phenomenon – 'defensive issue linkage.' As the scope of trade law expanded, it increasingly touched upon domestic and international environmental policies. As a result, environmental groups mobilized to seek carve-outs that preserve their traditional policy space. However, their opposition also led to the increased inclusion of proactive clauses that further the linkage between trade and the environment as policymakers strove to bolster ratifying coalitions. Using qualitative evidence from the US, EU, and Malaysia, I show that environmental groups mobilize in reaction to the expanding scope of trade policies and explore how this influences trade agreement content. A quantitative analysis of preferential trade agreements concluded between 1989 and 2016 then shows that general patterns of environmental clause inclusion are consistent with the channel of 'defensive issue linkage.' [ABSTRACT FROM AUTHOR]