Fossil Fuels - Energy sources from ancient plants and animals, Coal - Solid fossil fuel used primarily for electricity generation, Oil - Liquid fossil fuel extracted and refined for energy, Natural Gas - Cleaner-burning fossil fuel, primarily methane, Fracking - Extraction method that can cause groundwater contamination, Carbon Dioxide - Greenhouse gas released by fossil fuel combustion, Radioactive Waste - Byproduct of nuclear energy that poses storage challenges, Air Pollution - Harmful byproduct of burning fossil fuels, Climate Change - Global effect of greenhouse gas emissions,

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