Fossil fuels

Objective: Explain coal and petroleum, distinguish their meanings, and apply them to a described case.

Coal: Coal is a carbon-rich fossil fuel derived largely from transformed ancient plant material. Petroleum: Petroleum is a mixture of hydrocarbons refined into fuels and other products. Fossil fuels provide energy through chemical reactions that also produce emissions. Different fuels, extraction methods, and controls create different pollutant profiles. Natural gas combustion typically differs from coal combustion, but methane leakage and the full system boundary affect climate comparisons. Energy benefits and local environmental burdens may occur in different places. A fair assessment tracks extraction, transport, combustion, and waste rather than only emissions at the final burner. Application: A power station burns a solid carbon-rich fuel. This most directly illustrates coal. A refinery separates crude oil into useful fractions. This most directly illustrates petroleum.

Objective: Explain natural gas and combustion emissions, distinguish their meanings, and apply them to a described case.

Natural gas: Natural gas is a gaseous fossil fuel composed mainly of methane. Combustion emissions: Combustion can release carbon dioxide and other pollutants depending on fuel and operating conditions. Fossil fuels provide energy through chemical reactions that also produce emissions. Different fuels, extraction methods, and controls create different pollutant profiles. Natural gas combustion typically differs from coal combustion, but methane leakage and the full system boundary affect climate comparisons. Energy benefits and local environmental burdens may occur in different places. A fair assessment tracks extraction, transport, combustion, and waste rather than only emissions at the final burner. Application: A building burns a methane-rich fuel for heat. This most directly illustrates natural gas. Fuel burning adds carbon dioxide to the atmosphere. This most directly illustrates combustion emissions.

Objective: Explain methane leakage and extraction trade-offs, distinguish their meanings, and apply them to a described case.

Methane leakage: Escaped methane contributes to greenhouse warming and must be included in system assessments. Extraction trade-offs: Extraction creates benefits and environmental costs that vary by method, location, and management. Fossil fuels provide energy through chemical reactions that also produce emissions. Different fuels, extraction methods, and controls create different pollutant profiles. Natural gas combustion typically differs from coal combustion, but methane leakage and the full system boundary affect climate comparisons. Energy benefits and local environmental burdens may occur in different places. A fair assessment tracks extraction, transport, combustion, and waste rather than only emissions at the final burner. Application: Gas leaks before the fuel reaches a burner. This most directly illustrates methane leakage. A fuel project is assessed for water, habitat, and employment effects. This most directly illustrates extraction trade-offs.