Unit 1: Environmental philosophy. Is the precautionary principle a sound approach to risk analysis? -- Is sustainable development compatible with human welfare? -- Should a price be put on the goods and services provided by the world's ecosystems? -- Unit 2: Principles versus politics. Should the Endangered Species Act be strengthened? -- Should the EPA be doing more to fight environmental injustice? -- Can pollution rights trading effectively control environmental problems? -- Unit 3: Energy issues. Should the Arctic National Wildlife Refuge be opened to oil drilling? -- Is global warming skepticism just smoke and mirrors? -- Is wind power green? -- Should cars be more efficient? -- Do biofuels enhance energy security? -- Is it time to revive nuclear power? -- Unit 4: Food and population. Do falling birthrates pose a threat to human welfare? -- Is genetic engineering the answer to hunger? -- Is a large-scale shift to organic farming the best way to increase world food supply? -- Unit 5: Toxic chemicals. Should DDT be banned worldwide? -- Do environmental hormone mimics pose a potentially serious health threat? -- Is the Superfund program successfully protecting human health form hazardous materials? -- Should the United States reprocess spent nuclear fuel?