What is the greenhouse effect? What causes it? How do human activities impact the global climate? What are the differences between preventive and adaptive strategies? What are examples of each? What are the results of cost-benefit analyses of global climate change? What are the potential problems with these analyses? What are the relationships between climate change policy and GDP? How could carbon taxes be used to reduce the rate of global climate change? What is the relationship between gas prices and gas consumption across countries? How could a system of tradable permits be used to reduce carbon emissions? How would the Kyoto protocol reduce carbon emissions? Why is the protocol meeting resistance? What are some additional policy tools that could be used to reduce carbon emissions? What is the debate over carbon "sinks"?