Question

Which of the following is the most-polluting energy source?

coal
natural gas
oil
biomass

Answer 1

Coal is generally considered the most-polluting energy source among the options listed. It produces the highest carbon dioxide emissions per unit of energy generated and is also associated with a variety of other pollutants, including sulfur dioxide, nitrogen oxides, and particulate matter. While oil and biomass can also produce significant emissions, coal typically has the highest overall environmental impact. Natural gas is cleaner-burning than coal and oil, producing less CO2 and other pollutants when combusted.