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Historical trends in energy use; biomass, fossil fuels, electricity (p. 4) United states energy supply (domestic and imports) and demand by source (p. 4) United states energy consumption by end-use sector (p. 4) Environmental impacts of energy use (particularly fossil fuels) (p. 5) Burning fossil fuels releases a number of toxic substances into the atmosphere and hydrosphere, like sulfur, nitrogen, and mercury. Both sulfur and nitrogen can combine with water vapor to produce sulfuric and nitric acid, which may fall as acid rain, severely damaging forests and even buildings. Global climate change is also linked to energy consumption through the release of methane, nitrous oxides, and carbon dioxide. Signi cant sources of these emissions include coal mining; natural gas production, processing, and distribution; and combustion in passenger cars. Mainly used in the form of burning wood for energy. Direct combustion, which involves burning biomass resources to produce steam. This steam then turns a turbine, which powers an electricity generator.

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