Long Answer to Short WTO Deputy Director-General Angela Ellard explained the role of international trade in addressing climate change at a meeting of “Global Leaders for Climate Action” but not in a straight-forward fashion. She properly endorsed a global carbon tax as the fairest means for addressing externalities and argued that generally taxes, tariffs, subsidies, regulatory measures and other instruments are relevant for implementing climate policies. She acknowledged that “it is tempting to think only that trade contributes to climate change through emissions caused by the production and transportation of goods. But this view is incomplete because trade is also a central part of the solution, enhancing both adaptatio...