Conclusions -- 4 ENDANGERED SPECIES -- Living Things as Natural Resources -- The Threat to Genetic Diversity -- Law and Policy -- Options for Preservation Policy -- 5 MARINE FISHERIES -- Fisheries in the U.S. Economy -- The Economics and Operation of Fisheries -- Regulation and Economic Efficiency -- Fisheries Management in the United States: Laws and Institutions -- How the System Works and What It Produces -- Current Health of Fisheries and Environmental Threats -- Conclusions and Recommendations -- 6 THE GLOBAL CLIMATE -- Climate and Human Activity -- Characteristics of Climate Problems.