10–15% of the AP exam. Key topics: Renewable vs. nonrenewable energy sources, Global energy consumption patterns and trends, Fossil fuels: coal formation, extraction methods, and environmental impacts, Fossil fuels: oil (petroleum) extraction, refining, and spill impacts, Fossil fuels: natural gas extraction (conventional and fracking) and impacts, Nuclear power: fission process, uranium fuel cycle, waste storage, and safety, Biomass energy: types and combustion impacts, Solar energy: photovoltaic and concentrated solar power, Hydroelectric power: conventional dams and run-of-river systems, Geothermal energy: sources and applications, Wind energy: turbine operation and siting considerations, Hydrogen fuel cells: operation and environmental profile, Energy return on investment (EROI), Energy conservation and efficiency strategies, Fuel efficiency calculations.
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