Trade liberalization affects the pattern and structure of agricultural production, with consequences for the environment. But what are these impacts? And do agri-environmental policies affect international competitiveness? This study takes an in-depth look at the pig sector in OECD countries and draws some conclusions about the most appropriate forms of policy intervention. Further trade liberalization is likely to strengthen market trends in the pig sector. Production is expected to slow, if not contract, in OECD European and Asian countries. In these countries, government support for pig production in the form of tariffs and/or export subsidies is generally the highest, and the environmental impacts of pig production on water and air pollution are of greatest concern. This book argues that liberalizing trade is therefore likely to generate some environmental benefits.--Publisher summary.