1. discuss the principle Environmental Protection within the WTO trading system

while discussing make refence of the following cases:

1. United States - Import Prohibition of Certain Shrimp and Shrimp Products WT/DS58/R (15 May 1998) 2.United States - Import Prohibition of Certain Shrimp and Shrimp Products WT/DS58/AB/R (12 October 1998) 3.United States - Import Prohibition of Certain Shrimp and Shrimp Products, Recourse to Article 21.5 WT/DS58RW (15 June 2001). 4. United States - Import Prohibition of Certain Shrimp and Shrimp Products, Recourse to Article 21.5 WT/DS58/AB/RW ("Article 21.5 Appeal") The Appellate Body on (22 October 2001).