This volume reviews present sources and levels of pollution in The Gulf, assesses their causes and effects on biota and ecosystems, and identifies preventive and remedial measures reducing levels of pollution and mitigating adverse impacts. It is organized in 5 sections: Part I: Environmental setting of The Gulf; Part II: Present sources and levels of pollution; Part III: Effects of marine pollution on ecosystems and biota; Part IV: Preventing and combating marine pollution; Part V: Overall conclusions and recommendations.