We employ a common agency model to examine how green lobbies affect the determination of trade and environmental policy in two large countries that are linked through trade flows and transboundary pollution. We show that, when governments are not restricted in their ability to use trade barriers, environmental lobbying always results in higher pollution taxes relative to a no-lobbying scenario. Consequently, uncoordinated environmental policies are closer to the effcient Pigouvian solution than internationally coordinated policies. If, however, governments are bound by international trade rules, green lobbies may bias environmental policies downwards and environmental policy coordination is unambiguously effciency-enhancing
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