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Abstract
We employ a common agency model to examine how green lobbies a®ect the determination of trade and environmental policy in two large countries that are linked through trade °ows 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 e±cient 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 e±ciency-enhancing.