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Copyright of Journal of Politics in Latin America is the property of Sage Publications Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article discusses issues related to presidentialism and presidential falls in South America. In a presidential system, presidents inevitably stand apart and above other political figures because of their special powers and special sources of legitimacy. The shape of these powers has been on the political agenda in South American countries nearly constantly. South America is unusual in the extreme flexibility of its presidential terms, especially in contrast with the classic case of U.S. presidentialism.

This article explores the role of environmental concerns in free trade areas made up entirely of developing countries. It surveys the environmental institutions of Mercosur, the Common Market of South America, and its member states. It also presents a case study of the recently terminated negotiations over a regional environmental legal instrument as an example of collective environmental decisionmaking. The article concludes that all the environmental components of the agreement are weak, and have even been downgraded in recent years. Even so, national environmental protections have increased during the years of the Mercosur agreement, and some regional actors are poised to join their northern counterparts in opposition to any potential free trade area of the Americas that does not include environmental provisions. [ABSTRACT FROM AUTHOR]